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Добірка наукової літератури з теми "Coherent optical pulses"

Автор: Grafiati
Опубліковано: 11 березня 2023

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Статті в журналах з теми "Coherent optical pulses"

1

SHARABY, Y. A., A. JOSHI, and S. S. HASSAN. "COHERENT POPULATION TRANSFER IN V-TYPE ATOMIC SYSTEM." Journal of Nonlinear Optical Physics & Materials 22, no. 04 (December 2013): 1350044. http://dx.doi.org/10.1142/s0218863513500446.

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In this paper, we investigate numerically the modeled density matrix equations for the interaction of a three-level atomic system in V-configuration with a train of chirped optical n-pulses (up to n = 10) within and without the rotating wave approximation. For adopted data of Rb 87, maximal population transfer to either of the upper levels is achieved with n > 1 pulse via variation of chirp parameter/frequency mismatch of the closely lying upper levels. Optimal steady population transfer and maximum atomic coherence of the upper levels are predicted for non-zero chirp parameter and train of n = 1 - 10, 30 pulses.
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2

Xue, Yinghong, Yueping Niu, and Shangqing Gong. "External Modulation Optical Coherent Domain Reflectometry with Long Measurement Range." Sensors 21, no. 16 (August 16, 2021): 5510. http://dx.doi.org/10.3390/s21165510.

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Optical coherent domain reflectometry (OCDR) can achieve a high spatial resolution that is independent of the bandwidth of the receiver, but the measurement range is usually very limited. Here we propose an external modulation OCDR system, in which a pair of linear frequency-modulated pulses generated by one modulator are employed as the probe pulse and the reference, respectively. The spatial resolution is determined by the frequency modulation range of the pulse, and the measurement speed is boosted by orders because the proposed technology can simultaneously diagnose a section of fiber with each pair of pulses, while only a single point can be accessed at a time in typical OCDR. In the demonstrational experiment, a measurement range of up to 50 km is achieved with a spatial resolution of 1.4 m and a measuring time of less than 30 s.
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3

Gabitov, Ildar R., Bridget Kennedy, and Andrei I. Maimistov. "Coherent Amplification of Optical Pulses in Metamaterials." IEEE Journal of Selected Topics in Quantum Electronics 16, no. 2 (2010): 401–9. http://dx.doi.org/10.1109/jstqe.2009.2032667.

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4

Semenov, A. L., and D. N. Bezbat’ko. "Coherent phonons excited by two optical pulses." Physics of the Solid State 58, no. 2 (February 2016): 333–35. http://dx.doi.org/10.1134/s106378341602027x.

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5

Jeong, Heejeong, та Ulf Österberg. "Coherent transients: optical precursors and 0π pulses". Journal of the Optical Society of America B 25, № 7 (28 березня 2008): B1. http://dx.doi.org/10.1364/josab.25.0000b1.

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6

Sinyavskii, A. V. "Coherent-difference detection of optical radiation pulses." Quantum Electronics 25, no. 6 (June 30, 1995): 605–6. http://dx.doi.org/10.1070/qe1995v025n06abeh000424.

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7

Aquila, A., M. Drescher, T. Laarmann, M. Barthelmeß, H. N. Chapman, and S. Bajt. "Moving the Frontier of Quantum Control into the Soft X-Ray Spectrum." International Journal of Optics 2011 (2011): 1–4. http://dx.doi.org/10.1155/2011/417075.

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The femtosecond nature of X-ray free electron laser (FEL) pulses opens up exciting research possibilities in time-resolved studies including femtosecond photoemission and diffraction. The recent developments of seeding X-ray FELs extend their capabilities by creating stable, temporally coherent, and repeatable pulses. This in turn opens the possibility of spectral engineering soft X-ray pulses to use as a probe for the control of quantum dynamics. We propose a method for extending coherent control pulse-shaping techniques to the soft X-ray spectral range by using a reflective geometry 4f pulse shaper. This method is based on recent developments in asymmetrically cut multilayer optic technology and piezoelectric substrates.
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8

Zaitsu, Shin-ichi, Takumi Tanabe, Kota Oshima, and Hiroyuki Hirata. "Theoretical Analysis of a Molecular Optical Modulator for a Continuous-Wave Laser Based on a Hollow-Core Photonic Crystal Fiber." Applied Sciences 8, no. 10 (October 12, 2018): 1895. http://dx.doi.org/10.3390/app8101895.

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A THz optical modulator for a continuous-wave laser using a hollow-core photonic crystal fiber (HC-PCF) was proposed and theoretically analyzed. Lightwaves traveling through the HC-PCF is modulated by interactions with coherently driven Raman-active molecules in the core. The coherent molecular motion is excited by a pulse train having an interval between successive pulses shorter than the molecular dephasing time. In principle, a rotational transition of molecular hydrogen (S 0 (1)) at a pressure of 1 atm has a long enough dephasing time to maintain molecular coherence during a 1 GHz commercially available mode-locked pulse train. Optimization of the waveguide dispersion would enable phase-matching between the probe beam and generated sidebands during optical modulation. The proposed scheme would be achievable with a reasonable pump beam power and HC-PCF length, and with a feasible pressure of molecules in the core.
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9

Nakano, Yuta, Anton D. Shutov, Totaro Imasaka, and Alexei V. Sokolov. "Generation of Ultrafast Optical Pulses via Molecular Modulation in Ambient Air." Applied Sciences 9, no. 12 (June 20, 2019): 2509. http://dx.doi.org/10.3390/app9122509.

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We investigated the possibility of making ever-shorter optical pulses by using the nonlinearity of ambient air. We produced a broad spectrum consisting of mutually coherent optical sidebands via collinear Raman generation driven by two picosecond laser pulses that are Raman-resonant with molecular vibrations of nitrogen. We demonstrated the ability to adjust the sideband phases via dispersion control which we accomplished by changing the optical path length of the generated multi-color beam through a pair of tilted glass plates. The resultant measured phases suggest the generation of a 3-fs optical pulse train.
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10

Sato, Takahiro, James M. Glownia, Matthiew R. Ware, Matthieu Chollet, Silke Nelson, and Diling Zhu. "A simple instrument to find spatiotemporal overlap of optical/X-ray light at free-electron lasers." Journal of Synchrotron Radiation 26, no. 3 (April 5, 2019): 647–52. http://dx.doi.org/10.1107/s1600577519002248.

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A compact and robust diagnostic to determine spatial and temporal overlap between X-ray free-electron laser and optical laser pulses was developed and evaluated using monochromatic X-rays from the Linac Coherent Light Source. It was used to determine temporal overlap with a resolution of ∼10 fs, despite the large pulse energy fluctuations of the monochromatic X-ray pulses, and covers a wide optical wavelength range from ultraviolet to near-infrared with a single configuration.
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Більше джерел

Дисертації з теми "Coherent optical pulses"

1

Hill, Karen Elizabeth. "Coherent effects of intense ultrashort optical pulses on diatomic molecules." Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/46340.

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2

Curbis, Francesca. "Generation of VUV ultra-short coherent optical pulses using electron storage rings." Doctoral thesis, Università degli studi di Trieste, 2008. http://hdl.handle.net/10077/2562.

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2006/2007
The need of coherent and intense pulsed radiation is spread among many research disciplines, such as biology, nanotechnology, physics, chemistry and medicine. The synchrotron light from traditional sources only partially meets these characteristics. A new kind of light source has been conceived and developed in the last decades: the Free-Electron Laser (FEL). The FEL process relies on the interaction between a relativistic electron beam and an electromagnetic wave in presence of a static and periodic magnetic field, produced by a device called undulator. This interaction generates coherent radiation at a fundamental frequency and its higher harmonics. In the standard configuration, the electron beam is generated by a linear accelerator and the interaction occurs in a single passage through one or several undulators. An alternative configuration can be obtained if the electrons are supplied by a storage ring. This work has been carried out at the Elettra laboratory within the ``new light sources'' group. My thesis focuses on both numerical and experimental issues about the generation of coherent harmonics on storage-ring FELs. The Elettra SRFEL has been originally designed to operate in ``oscillator configuration'' where the radiation is stored in an optical cavity (made of two mirrors). This process also drives the emission of radiation in the harmonics. In this work, different experimental methods have been implemented at Elettra to concentrate the power in giant pulses, both for the fundamental wavelength and its harmonics. Using this technique, it has been possible to generate fundamental radiation at 660 nm and 450 nm with (intra-cavity) power of few mJ and third harmonic radiation at 220 nm and 150 nm with few nJ of power. This process has been studied numerically by using a tri-dimensional simulation which also accounts for the re-circulation of the beam. The results of simulations are in good agreement with experimental measurements and allow to investigate the inner structure of the light below the picoseconds scale, where the instrumentation resolution reaches its limit. Structures of hundreds of femtoseconds inside the laser pulse have been found and this implies a higher peak power. Moreover, the numerical results have been confirmed by spectral measurements. By removing the optical cavity and focusing an external laser in the first undulator, a ``seeded single-pass'' configuration has been implemented. In the first undulator, the interaction with the external laser (``seed'') modulates the electron energy which is converted to spatial modulation (``bunching''). A Fourier analysis of the bunched electron-beam shows the presence of components at all harmonics (even and odd) and this explains why electrons in the second undulator can emit at any harmonic. To implement this configuration a design and layout plus tri-dimensional simulations were performed. Followed by the installation of the seed laser (Ti:Sapphire, lambda = 796 nm), the timing and the diagnostics. The commissioning focused on optimizing the spatial overlap and the synchronization between the electrons and the seed laser. Coherent harmonic radiation has been obtained at 265 nm, the third harmonic of the seed laser. After the characterization of this light, the seed frequency has been doubled by means of a nonlinear crystal. With this setup, radiation down to 99.5 nm (the fourth harmonic of the seed) has been generated. The shot-to-shot stability is comparable to the stability of the synchrotron radiation (fluctuations of few %) but the number of photons per pulse (~10^9) is about two-three orders of magnitude bigger than the synchrotron one. Thus this coherent radiation can be used for experiments similar to those suggested for the next generation FELs. Summarizing, the light source developed during my thesis is a unique facility able to generate coherent radiation with variable polarization, variable duration (between 100 fs and 1 ps), with peak power of the order of mega-Watts in a wide spectral VUV range. In the latest implementation, this radiation source has been used for two different kind of experiments, one in gas-phase, the other of solid state. The obtained results demonstrate the appealing of this source for user experiments. In perspective, there is a plan to extend the wavelength range below 100 nm and to improve the tunability of the source.
Vari ambiti della ricerca scientifica, dalla biologia alle nanotecnologie, passando per la fisica, la chimica e la medicina, richiedono per le loro indagini una radiazione spazialmente coerente con un elevato numero di fotoni per impulso. Poiché la radiazione di sincrotrone non possiede queste caratteristiche, negli ultimi anni gli sforzi si sono concentrati nello sviluppo delle cosiddette sorgenti di quarta generazione: i laser a elettroni liberi (LEL). Il processo LEL avviene per l'interazione di un'onda elettromagnetica con un fascio di elettroni relativistici in presenza di un campo magnetico. Tale campo, statico e periodico, viene generato da un dispositivo detto ondulatore. L'interazione produce emissione di luce coerente ad una frequenza fondamentale e alle sue armoniche superiori. La configurazione standard prevede che gli elettroni siano prodotti da un acceleratore lineare e l'interazione si risolve tipicamente in un singolo passaggio attraverso uno o più ondulatori. Una configurazione alternativa si ottiene quando gli elettroni sono forniti da un anello di accumulazione. La tesi si è svolta presso il laboratorio Elettra, nel gruppo che si occupa dello sviluppo di nuove sorgenti di luce. La mia attività di ricerca comprende sia aspetti teorico-numerici che sperimentali relativi alla generazione di armoniche coerenti su LEL installati su anelli di accumulazione. Storicamente il laser a elettroni liberi ad Elettra è nato in ``configurazione oscillatore'' (la radiazione è immagazzinata in una cavità ottica formata da due specchi). Ad ogni passaggio successivo gli elettroni interagiscono con l'onda electtromagnetica amplificandola fino all'instaurarsi dell'effetto laser. Questo processo guida anche l'emissione alle armoniche superiori. Diversi metodi sperimentali possono essere usati per concentrare la potenza in impulsi giganti, sia per la fondamentale che per le armoniche. Questa tecnica, che ho affinato durante il mio lavoro di tesi, ci ha permesso di generare potenze dell'ordine di alcuni mJ per la fondamentale (nella cavità) e di alcuni nJ alla terza armonica di 660 nm e di 450 nm, cioè 220 nm e 150 nm rispettivamente. Dal punto di vista numerico, per studiare questo processo abbiamo modificato un codice per simulare tridimensionalmente la nostra configurazione ed abbiamo aggiunto una parte che propaga gli elettroni lungo l'anello. Le simulazioni sono in ottimo accordo con i dati sperimentali e ci permettono di investigare più nel dettaglio l'impulso, nella scala temporale dei femtosecondi dove si arresta la risoluzione strumentale. Dalle simulazioni risulta che all'interno degli impulsi laser sono presenti delle substrutture della durata di alcune centinaia di femtosecondi. La presenza di tali strutture implica una potenza di picco maggiore. Abbiamo inoltre una conferma indiretta dei risultati numerici tramite le misure spettrali. Rimuovendo la cavità ottica e focalizzando un laser esterno nel primo ondulatore si può passare alla cosiddetta configurazione in ``singolo passaggio''. Nel primo ondulatore, l'interazione con il laser esterno (``seed'') produce una modulazione nell'energia degli elettroni, la quale viene trasformata in separazione spaziale (``bunching''). Un'analisi di Fourier del fascio di elettroni mostra componenti a tutte le armoniche (pari e dispari), per cui gli elettroni sono in grado di emettere a qualsiasi armonica nel secondo ondulatore. In questa configurazione la prima parte del lavoro di tesi è stata il design della linea e lo studio numerico dei risultati attesi. A questo studio preliminare è seguita l'installazione dell'esperimento, a partire dall'alloggiamento e la messa in funzione del laser esterno (Ti:Sapphire, lambda = 796 nm) fino alla realizzazione del sistema di sincronizzazione del seed con gli elettroni. Prima di ottenere la radiazione armonica coerente e poter confrontare le aspettative con i risultati sperimentali abbiamo dovuto dedicare molti turni di fisica di macchina al perfezionamento della sovrapposizione spaziale e temporale tra elettroni e laser esterno. La prima radiazione armonica coerente è stata ottenuta alla terza armonica (265 nm) del laser esterno. Dopo una prima caratterizzazione della sorgente, abbiamo introdotto un cristallo nonlineare per generare la seconda armonica del laser esterno e usare questa come seed. Attualmente il LEL di Elettra è in grado di produrre radiazione fino a 99.5 nm (la quarta armonica del seed) con la stessa stabilità della radiazione di sincrotrone (flutuazioni dell'ordine del %). Queste caratteristiche, insieme al numero di fotoni per impulso (~10^9) che supera di almeno due ordini di grandezza l'emissione di sincrotrone, permettono l'utilizzo della luce prodotta per esperimenti simili a quelli proposti per le sorgenti di quarta generazione. Riassumendo, la sorgente sviluppata durante la mia tesi è attualmente l'unica in grado di fornire luce coerente di durata variabile tra 100 fs e 1 ps con potenze dell'ordine del mega-Watt e polarizzazione variabile (lineare-circolare) in un ampia gamma spettrale nell'ultravioletto. Negli ultimi turni, questa radiazione è stata usata su due diversi tipi di esperimenti, uno in fase gassosa l'altro di stato solido. I risultati ottenuti dimostrano che la radiazione emessa può essere appetibile per gli utenti. Le prospettive sono estendere il range di lunghezze d'onda sotto i 100 nm e migliorare la tunabilità della sorgente.
XX Ciclo
1979
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3

Boleat, Elizabeth Durrell. "Coherent control of electronic and vibrational wave packets using phase-locked optical pulses." Thesis, University College London (University of London), 2005. http://discovery.ucl.ac.uk/1445323/.

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Experimental and theoretical work is presented on the control of wave packet dynamics in atomic and molecular systems. Using sequences of phase-locked optical pulses, the link between optical phase and quantum mechanical phase is explored in the Na atom and Naj dimer, representing a step towards the logical engineering of quantum states in more complicated systems. A novel apparatus, constructed to study and control the vibrational dynamics of vibrational wave packets on the Na ionic potential surface, is described in chapter 3. Theoretical simulations for proposed experiment are presented in chapter 4. Control is achieved by exploiting the phase-evolution of the constituent vibrational quantum states within the wave packet superposition. The phase relationship and the accumulated phase difference between the various components of the wave packet is determined, and a sequence of phase-locked optical pulses is employed to selectively enhance or depopulate specific vibrational states, or sets of vibrational states. The quantum state composition of the resulting wave packet, and the efficiency of the control scheme, is determined by calculating the multi-pulse response of the time-dependent vibrational state populations. In chapter 5, the quantum interference between Rydberg electron wave packets in the Na atom is investigated using pairs of phase-locked wave packets, allowing manipulation of the total orbital angular momentum of Na Rydberg atoms. Initially the wave packet is composed of a superposition of s and d Rydberg series. Exploitation of the difference between the quantum defects of the two series allows specific angular momentum compositions within the resultant wave packet to be engineered. Experimentally, this final quantum state distribution is analysed in the frequency domain using state selective field ionisation, and in the time domain using the optical Ramsey method. The theoretical calculations show how the phase difference between pairs of optical pulses is linked to the corresponding Rydberg frequency spectrum, therefore enabling the control of the quantum state composition of the wave packets.
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4

Pawłowska, Monika [Verfasser]. "Shaped femtosecond pulses for coherent control transported via an optical fiber in the nonlinear regime / Monika Pawłowska." Berlin : Freie Universität Berlin, 2012. http://d-nb.info/1027815545/34.

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5

Harper, Matthew R. "Control and measurement of ultrafast pulses for pump/probe-based metrology." Thesis, St Andrews, 2007. http://hdl.handle.net/10023/430.

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6

Shokeen, Vishal. "Ultrafast magnetization dynamics in ferromagnetic transition metals : a study of spins thermalization induced by femtosecond optical pulses and of coupled oscillators excited by picosecond acoustic pulses." Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAE035.

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Dans cette thèse, nous avons étudié la dynamique d'aimantation selon deux échelles de temps en utilisant la technique pompe-sonde magnéto-optique résolue en temps. A l'échelle de la picoseconde, la précession de l'aimantation est induite par des impulsions acoustiques dans des structures multicouches composées de deux couches ferromagnétique séparées par une couche métallique (Ni/Au/Py) avec différentes épaisseurs. La synchronisation de la précession des couches ferromagnétiques couplées a été observée. La modification de la précession de l'aimantation d'une couche de Ni est due l'interaction d'échange intercouche avec la couche Py. A l'échelle de 50fs, nous avons étudié la dynamique magnéto-optique cohérente, athermale, thermale et la relaxation des charges et des spins dans (Ni, Co et Fe) par impulsions de 11 fs dans un régime de faible perturbation. L'interaction spin-orbite et l'interaction d'échange jouent un rôle significatif dans la désaimantation ultrarapide
In this thesis, we have investigated the magnetization dynamics at picosecond and femtosecond time scale using time resolved magneto-optical pump probe technique. At picosecond time scale, the magnetization precession is induced by ultrafast acoustic pulses in a three layered structure with two ferromagnetic layers separated by varying thickness of metallic spacer layer (Ni/Au/Py). The magnetization precession dynamics of the Ni layer is modified due to the interlayer exchange interaction with the Py layer and the synchronized precession of the coupied ferromagnetic layers has been observed. At the timescale of 50fs, coherent magneto-optical, non-thermal, thermal and relaxation dynamics of charges and spins in ferromagnetic transition metals (Ni, Co and Fe) is studied by using 11fs optical pulses in a very low perturbation regime. The spin orbit interaction and exchange interaction play a significant role in the demagnetization of the ferromagnetic metals induced by femtosecond pulses
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Le, Dortz Jérémy. "Mise en phase active de fibres laser en régime femtoseconde par méthode interférométrique." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLX071/document.

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Les sources lasers femtosecondes sont utilisées dans grand nombre d’applications (industrielles, médicales, de recherche fondamentale) avec un besoin croissant d’impulsions très énergétiques à haut taux de répétition. Bien que la technologie Ti:Saphir fournisse des impulsions PetaWatt, son taux de répétition s’avère limité. Une alternative est l’utilisation de la technologie fibrée. Cependant, l’énergie extractible d’une seule fibre est intrinsèquement limitée.Une solution prometteuse est alors de réaliser une combinaison de fibres (jusqu’à plus de 10 000 fibres pour l’accélération de particules). La combinaison de fibres par méthode interférométrique (avec un record de 64 fibres combinées en régime continu) a prouvé qu’elle était un excellent candidat pour la combinaison d’un grand nombre de fibres.La collaboration XCAN entre l’Ecole Polytechnique et Thales, vise à réaliser un démonstrateur de combinaison cohérente de 61 fibres amplifiées en régime femtoseconde. Les travaux menés au cours de cette thèse s’inscrivent dans ce projet.Dans un premier temps, afin d’étudier les points durs inhérents au régime femtoseconde tout en s’affranchissant des difficultés liées à l’amplification, la méthode interférométique en régime femtoseconde a été étudiée sur un démonstrateur passif, c’est-à-dire sans amplification, de 19 fibres. Une fois la méthode de mise en phase validée celle-ci a pu être testée avec succès sur le démonstrateur avec amplification du projet XCAN.Nous présentons également les travaux menés afin d’augmenter un paramètre clé des systèmes de combinaison de faisceaux à savoir : l’efficacité de combinaison du système laser. Pour cela, nous avons réalisé une mise en forme de faisceaux issus des fibres de la tête optique. Cette mise en forme, gaussien vers super-gaussien, est réalisée à l’aide de deux réseaux de lames de phase dont nous présenterons le calcul des profils asphériques. Afin de valider expérimentalement nos simulations et après réalisation des lames de phase nous avons pu tester celles-ci sur le démonstrateur passif, démontrant une augmentation de 14 %.Les travaux présentés dans ce manuscrit présentent ainsi les premiers par vers la réalisation d’une nouvelle architecture laser massivement parallèle, capable de délivrer à la fois une haute puissance crête et une haute puissance moyenne
Femtosecond fiber sources are used in a large number of applications (industrial, medical, fundamental physics) with a growing need in high energy pulses at high repetion rate. Although Ti: Saphirre technology provides energies up to PetaWatt, its repetion rate is low (up to 1 Hz). An alternative is to use an amplified fiber. However, the extractable energy of a single fiber is intrinsically limited.A solution is then to combine several fibers (up to 10 000 fibers for particle acceleration). Coherent beam combining of fibers with an interferometric method (with a record of 64 fibers combined in the cw regime) has proven to be an excellent candidate to combine a large number of fibers.The XCAN project, a collaboration between l'Ecole polytechnique and Thales, aims to realize a demonstrator of 61 fibers coherently combined in the femtosecond regime.The works presented in this thesis are part of this project.In order to study the hard points inherent to the femtosecond regime and to free from the amplification issues, the interferometric method has been implemented on a passive demonstrator, meaning without amplification, of 19 fibers. Once the interferometric method validated, it has been succesfully tested on the amplified XCAN demonstrator.We present also the works done to increase a key parameter of beam combining systems : the combining efficiency. To do this, we have realized a beam shaping of the fiber array output beams. This beam shaping, gaussian to super-gaussian, is done with two arrays of phase plates. The aspherical profiles calculation is described. In order to validate our simulations we have tested the phase plates on the passive demonstrator by getting an increase of 14 %.The works presented in this manuscript are the first steps towards a new massively parallel laser architecture, able to provide both high peak power and high average power
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8

Voratovic, Dayen Chad. "Generation and Detection of Coherent Pulse Trains in Periodically Poled Lithium Niobate Through Optical Parametric Amplification." University of Dayton / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1324406162.

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9

McCracken, Richard A. "Femtosecond optical parametric oscillator frequency combs for coherent pulse synthesis." Thesis, Heriot-Watt University, 2013. http://hdl.handle.net/10399/2702.

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Coherent pulse synthesis takes as its objective the piecewise assembly of a sequence of identical broadband pulses from two or more mutually-coherent sequences of narrowband pulses. The requirements for pulse synthesis are that the parent pulses share the same repetition frequency, are phase coherent and have low mutual timing jitter over the required observation time. The work carried out in this thesis explored the requirements for broadband coherent pulse synthesis between the multiple visible outputs of a synchronously pumped femtosecond optical parametric oscillator. A femtosecond Ti:sapphire laser was characterised and used to pump a PPKTP-based OPO that produced a number of second-harmonic and sum-frequency mixing outputs across the visible region. Using a novel lock-to-zero CEO stabilisation technique, broadband phase coherence was established between all the pulses on the optical bench, producing the broadest zero-offset frequency comb to date. Employing a common optical path for all the pulses provided common-mode rejection of noise, ensuring less than 150 attoseconds of timing jitter between the pulses over a 1 second observation window. The parent pulses were compressed and their relative delays altered in a quasi-common path prism delay line, allowing pulse synthesis at a desired reference plane.
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Dunning, Alexander. "Coherent atomic manipulation and cooling using composite optical pulse sequences." Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/364735/.

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The laser cooling of atoms to ultracold temperatures has propelled many groundbreaking advances in fundamental research and precision measurement, through such applications as quantum simulators and interferometric sensors. Laser cooling remains, however, highly species-selective, and techniques for its application to molecules are still in their infancy. This thesis broadly concerns the development of laser cooling schemes, based on sequences of coherent optical pulses, which can in principle be applied to a wide range of species. We describe a cooling scheme, in which a velocity-selective impulse analogous to that in Doppler cooling is generated by a light-pulse Ramsey interferometer, and present a proof-of-concept demonstration of the scheme using ultracold rubidium-85 atoms as a test-bed. We realise an interferometer for the atoms, as they are in free-fall after release from a magneto-optical trap, by inducing stimulated Raman transitions between their ground hyperfine states. We provide a comprehensive characterisation of these Raman light-pulse interferometer optics, where particular attention is paid to light shift effects. Raman pulses, and indeed coherent operations in any quantum control system, unavoidably suffer from systematic errors in the control field intensity and frequency, and these lead to reductions in pulse fidelity and readout contrast. In parallel to the work on interferometric cooling in this thesis, we report our preliminary investigations into composite pulses, whereby `naive' single pulses are replaced by sequences of rotations with tailored durations and phases, for improving pulse fidelity in the presence of inhomogeneities. We find that composite pulses can indeed be highly effective in our cold atom system, and propose that their application in such devices as interferometric sensors is a promising prospect.
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Книги з теми "Coherent optical pulses"

1

S, Chesnokov Sergei, Kandidov V. P, Koroteev N. I, Scientific Council for Coherent and Nonlinear Optics (Rossiĭskai͡a︡ akademii͡a︡ nauk), and Russia (Federation). Ministerstvo nauki i tekhnologiĭ., eds. ICONO '98: Nonlinear optical phenomena and coherent optics in information technologies : 29 June-3 July 1998, Moscow, Russia. Bellingham, Wash., USA: SPIE, 1999.

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2

ICONO, 2005 (2005 Saint Petersburg Russia). ICONO 2005: Ultrafast phenomena and physics of superintense laser fields, quantum and atom optics, engineering of quantum information : 11-15 May 2005, St. Petersburg, Russia. Bellingham, Wash: SPIE, 2006.

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3

Manipulating quantum structures using laser pulses. Cambridge, UK: Cambridge University Press, 2011.

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4

N, Drabovich Konstantin, Akadėmii͡a︡ navuk Belarusi, and Society of Photo-optical Instrumentation Engineers., eds. ICONO 2001: Nonlinear optical phenomena and Nonlinear dynamics of optical systems : 26 June-1 July 2001, Minsk, Belarus. Bellingham, Washington: SPIE, 2002.

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5

United States. National Aeronautics and Space Administration., ed. Analysis of technology for solid state coherent lidar: Contract no. NAS8-38609 ... contract period: September 20, 1996 - June 30, 1997. [Washington, DC: National Aeronautics and Space Administration, 1997.

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6

United States. National Aeronautics and Space Administration., ed. Analysis of technology for solid state coherent lidar: Contract no. NAS8-38609 ... contract period: September 20, 1996 - June 30, 1997. [Washington, DC: National Aeronautics and Space Administration, 1997.

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7

Yu, Chikishev Andrey, Natsyi͡a︡nalʹnai͡a︡ akadėmii͡a︡ navuk Belarusi, Belaruski rėspublikanski fond fundamentalʹnykh dasledavanni͡a︡ŭ., and Society of Photo-optical Instrumentation Engineers., eds. ICONO 2001: Novel trends in nonlinear laser spectroscopy and optical diagnostics and Lasers in chemistry, biophysics, and biomedicine : 26 June-1 July, 2001, Minsk, Belarus. Bellingham, Wash., USA: SPIE, 2002.

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8

N, Bagayev S., Natsyi͡a︡nalʹnai͡a︡ akadėmii͡a︡ navuk Belarusi, and Belarusian Republic Foundation for Fundamental Research., eds. ICONO 2001: Quantum and atomic optics, high precision measurements in optics, and optical information processing, transmission, and storage : 26 June-1 July 2001, Minsk, Belarus. Bellingham, Wash: SPIE, 2002.

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9

M, Gordienko Vyatcheslav, Afanasʹev Anatoly A, Shuvalov Vladimir V, Natsyi͡a︡nalʹnai͡a︡ akadėmii͡a︡ navuk Belarusi, Belaruski rėspublikanski fond fundamentalʹnykh dasledavanni͡a︡ŭ., and Society of Photo-optical Instrumentation Engineers., eds. ICONO 2001: Ultrafast phenomena and strong laser fields : 26 June-1 July 2001, Minsk, Belarus. Bellingham, Wash., USA: SPIE, 2002.

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10

V, Andreev A., Natsyi͡a︡nalʹnai͡a︡ akadėmii͡a︡ navuk Belarusi, Belaruski rėspublikanski fond fundamentalʹnykh dasledavanni͡a︡ŭ., and Society of Photo-optical Instrumentation Engineers., eds. ICONO 2001: Fundamental aspects of laser-matter interaction and Physics of nanostructures : 26 June-1 July 2001, Minsk, Belarus. Bellingham, Wash., USA: SPIE, 2002.

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Частини книг з теми "Coherent optical pulses"

1

Kobayashi, Yohei, Dai Yoshitomi, Masayuki Kakehata, Hideyuki Takada, and Kenji Torizuka. "Coherent Synthesis of Multicolor Femtosecond Pulses." In Springer Series in Optical Sciences, 95–101. New York, NY: Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-49119-6_12.

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Fernández-Rossier, J., D. Porras, C. Tejedor, and R. Merlin. "Coherent Response to Optical Pulses in Quantum Wells." In Optical Properties of Semiconductor Nanostructures, 143–57. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4158-1_15.

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Sokolov, A. V. "Single-Cycle Optical Pulses Produced by Coherent Molecular Oscillations." In Springer Series in OPTICAL SCIENCES, 37–48. New York, NY: Springer New York, 2004. http://dx.doi.org/10.1007/978-0-387-34756-1_3.

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Sekikawa, Taro. "Gratings for Ultrashort Coherent Pulses in the Extreme Ultraviolet." In Springer Series in Optical Sciences, 175–93. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-47443-3_9.

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5

Ishikawa, Kenichi L., and Kiyoshi Ueda. "Temporal Coherent Control of Two-Photon Ionization by a Sequence of Ultrashort Laser Pulses." In Springer Series in Optical Sciences, 377–85. New York, NY: Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-49119-6_50.

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Jedrkiewicz, Ottavia, Matteo Clerici, Daniele Faccio, and Paolo Di Trapani. "Generation and control of coherent conical pulses in seeded optical parametric amplification." In Springer Series in Chemical Physics, 825–27. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-95946-5_268.

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Haner, M., and W. S. Warren. "Synthesis and Applications of Arbitrarily Shaped Optical Pulses in Coherent Spectroscopy and Nonlinear Pulse Propagation." In Ultrafast Phenomena VI, 139–41. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-83644-2_40.

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Maimistov, A. I., and A. M. Basharov. "Coherent Pulse Propagation." In Nonlinear Optical Waves, 255–302. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-017-2448-7_5.

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Matsubara, Eiichi, Taro Sekikawa, and Mikio Yamashita. "Generation of Ultrashort Optical Pulses Using Multiple Coherent Anti-Stokes Raman Scattering Signals in a Crystal and Observation of the Raman Phase." In Springer Series in Chemical Physics, 828–30. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-95946-5_269.

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Hache, F., and G. M. Gale. "Generation of Highly Coherent Tunable Femtosecond Pulses at 82 MHz in the Visible and Mid-Infrared Using a Blue-Pumped Optical Parametric Oscillator." In Ultrafast Processes in Spectroscopy, 369–72. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4615-5897-2_83.

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Тези доповідей конференцій з теми "Coherent optical pulses"

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Wilson, William L., Amy E. Frost, John T. Fourkas, G. Wäckerle, and M. D. Fayer. "Picosecond phase-coherent optical pulses." In AIP Conference Proceedings Volume 172. AIP, 1988. http://dx.doi.org/10.1063/1.37470.

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Belenov, Edward M., and Peter P. Vasil’ev. "Coherent Effects in Ultrashort Pulse Generation by a Semiconductor Injection Laser." In Nonlinear Dynamics in Optical Systems. Washington, D.C.: Optica Publishing Group, 1990. http://dx.doi.org/10.1364/nldos.1990.tdsls57.

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Effects of coherent interaction of ultrashort pulses with an injection laser active medium are investigated both theoretically and experimentally. A breakup of the picosecond pulse envelop into subpulses and a train of coherent pulses with a repetition rate nearly 100 GHz are observed for the first time. The theoretical treatment of the laser dynamics is based on the Maxwell-Bloch equation taking into account the dependence of the intraband relaxation time on the electromagnetic field amplitude of the picosecond pulse, the inhomogenious line brodening mechanism and Raman scattering within the laser cavity.
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3

Bahrdt, J., U. Flechsig, W. Grizzoli, and F. Siewert. "Propagation of coherent light pulses with PHASE." In SPIE Optical Engineering + Applications, edited by Manuel Sanchez del Rio and Oleg Chubar. SPIE, 2014. http://dx.doi.org/10.1117/12.2065228.

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Lotshaw, William T., Dale McMorrow, and Geraldine A. Kenney-Wallace. "Role of coherent coupling in the femtosecond time-resolved optical Kerr effect in simple liquids." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1987. http://dx.doi.org/10.1364/oam.1987.thr4.

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Time-resolved pump-probe spectroscopies in the picosecond and femtosecond time domains exhibit an apparently instantaneous signal when the pump and probe laser pulses are temporally and spatially overlapped. This signal is related to the coherence properties of the laser pulses as well as to the material response. Meaningful information concerning the microscopic material response can only be extracted following a quantitative assessment of the coherence contribution to the measured signal. We present new results on this instantaneous signal via the femtosecond time-resolved optical Kerr effect in a wide variety of simple room-temperature liquids including CS2, benzene and its monohalogenated analogs, and several polyhalogenated methanes. A dramatic effect of the laser pulse width on the amplitude of the instantaneous signal (which is well described as a scalar multiple of the laser pulse intensity autocorrelation) is observed. Purely coherent contributions to this instantaneous signal are related to the electric field cross-correlation of the pump and probe pulses and have a definite symmetry in the time delay between these pulses that depends on the phase of the local oscillator in our optically heterodyned detection scheme.
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Jin, Y., S. M. Cristescu, F. J. M. Harren, and J. Mandon. "Tunable High Repetition Rates Femtosecond Pulses from an Optical Parametric Oscillator." In Mid-Infrared Coherent Sources. Washington, D.C.: OSA, 2016. http://dx.doi.org/10.1364/mics.2016.ms3c.7.

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Sweetser, John, Thomas J. Dunn, and Ian A. Walmsley. "Coherent amplification without inversion of femtosecond optical pulses." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1993. http://dx.doi.org/10.1364/oam.1993.tha.3.

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Recent progress has been made in the theoretical and experimental study of the amplification of optical signals without population inversion (AWI) of the participating electronic levels. Induced coherence among appropriate levels in the active medium is the necessary condition for obtaining AWI. Similarly, the generation of wave packet states in atoms and molecules also relies on the coherent superposition of several states. It is feasible, therefore, that AWI is possible in a system which has been excited into a wave packet state. We have thus demonstrated experimentally such amplification in an extended sample of sodium dimers and we term this process wave packet amplification (WPA). An important characteristic of WPA is that the gain is doubly phase-sensitive—it is modulated at both the wave packet oscillation period and the optical period. The former time-dependence is a result of the periodic revivals of the pump-induced electronic polarization and the latter optical phase-sensitivity is a manifestation of the coherent nature of the molecular wave packet. The experiments to be described use a time-resolved upconversion method to detect the change in energy of a 50 fs probe pulse after it passes through a sodium heat pipe that has been pumped with another 50 fs pulse. The maximum saturated energy gain in this system is four and corresponds to all of the available energy being transferred from the wave packet to the probe pulse.
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Lynch, Stephen A., P. Thornton Greenland, Alexander F. G. van der Meer, Benedict N. Murdin, Carl R. Pidgeon, Britta Redlich, Nguyen Q. Vinh, and Gabriel Aeppli. "Quantum control in silicon using coherent THz pulses." In SPIE Optical Engineering + Applications, edited by Manijeh Razeghi, Alexei N. Baranov, Henry O. Everitt, John M. Zavada, and Tariq Manzur. SPIE, 2012. http://dx.doi.org/10.1117/12.928571.

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Saastamoinen, Toni, and Hanna Lajunen. "Non-uniformly correlated partially coherent beams and pulses." In SPIE Optical Engineering + Applications, edited by Andrew Forbes and Todd E. Lizotte. SPIE, 2014. http://dx.doi.org/10.1117/12.2061965.

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Nuss, M. C., and D. H. Auston. "Propagation of Coherent Phonon Polaritons in LiTaO3 Measured By Fir-Cerenkov Pulses." In International Conference on Ultrafast Phenomena. Washington, D.C.: Optica Publishing Group, 1986. http://dx.doi.org/10.1364/up.1986.tub4.

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We have previously shown that optical rectification of femtosecond laser pulses in electro-optic materials produces a Cerenkov cone of an extremely short electromagnetic pulse with a duration of ≃ 300 fsec and a frequency spectrum extending up to 6 THz1. In ionic crystals the far infrared pulse is strongly coupled to the transverse optical lattice modes, thus propagating as a polariton, i.e. a coupled phonon-photon excitation. The coherent polariton can be traced in time and space as it travels away from the generating optical femtosecond pulse.
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Fischer, Kevin A., Rahul Trivedi, Vinay Ramasesh, Irfan Siddiqi, and Jelena Vučković. "Scattering of Coherent Pulses from Quantum-Optical Systems." In CLEO: QELS_Fundamental Science. Washington, D.C.: OSA, 2018. http://dx.doi.org/10.1364/cleo_qels.2018.fm3h.4.

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Звіти організацій з теми "Coherent optical pulses"

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Bharadwaj, V. Ultrashort Optical Pulses in the Linac Coherent Light Source. Office of Scientific and Technical Information (OSTI), January 2005. http://dx.doi.org/10.2172/839696.

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Tatchyn, R. Short-Pulse Limits in Optical Instrumentation Design for the SLAC Linac Coherent Light Source (LCLS). Office of Scientific and Technical Information (OSTI), January 2005. http://dx.doi.org/10.2172/839699.

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Babbitt, W. R., Mingzhen Tian, and Kelvin Wagner. Applications of Optical Coherent Transient Technology to Pulse Shaping, Spectral Filtering, Arbitrary Waveform Generation and RF Beamforming. Fort Belvoir, VA: Defense Technical Information Center, April 2006. http://dx.doi.org/10.21236/ada452139.

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Perdigão, Rui A. P. New Horizons of Predictability in Complex Dynamical Systems: From Fundamental Physics to Climate and Society. Meteoceanics, October 2021. http://dx.doi.org/10.46337/211021.

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Discerning the dynamics of complex systems in a mathematically rigorous and physically consistent manner is as fascinating as intimidating of a challenge, stirring deeply and intrinsically with the most fundamental Physics, while at the same time percolating through the deepest meanders of quotidian life. The socio-natural coevolution in climate dynamics is an example of that, exhibiting a striking articulation between governing principles and free will, in a stochastic-dynamic resonance that goes way beyond a reductionist dichotomy between cosmos and chaos. Subjacent to the conceptual and operational interdisciplinarity of that challenge, lies the simple formal elegance of a lingua franca for communication with Nature. This emerges from the innermost mathematical core of the Physics of Coevolutionary Complex Systems, articulating the wealth of insights and flavours from frontier natural, social and technical sciences in a coherent, integrated manner. Communicating thus with Nature, we equip ourselves with formal tools to better appreciate and discern complexity, by deciphering a synergistic codex underlying its emergence and dynamics. Thereby opening new pathways to see the “invisible” and predict the “unpredictable” – including relative to emergent non-recurrent phenomena such as irreversible transformations and extreme geophysical events in a changing climate. Frontier advances will be shared pertaining a dynamic that translates not only the formal, aesthetical and functional beauty of the Physics of Coevolutionary Complex Systems, but also enables and capacitates the analysis, modelling and decision support in crucial matters for the environment and society. By taking our emerging Physics in an optic of operational empowerment, some of our pioneering advances will be addressed such as the intelligence system Earth System Dynamic Intelligence and the Meteoceanics QITES Constellation, at the interface between frontier non-linear dynamics and emerging quantum technologies, to take the pulse of our planet, including in the detection and early warning of extreme geophysical events from Space.
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