Bibliographies thématiques / Ultra-short optical pulses

Littérature scientifique sur le sujet « Ultra-short optical pulses »

Auteur : Grafiati
Publié le 11 mars 2023

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Articles de revues sur le sujet "Ultra-short optical pulses"

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ABDULRAHMAN, Hayder J., et Suzan B. MOHAMMED. « DEVELOPMENT OF ULTRA-SHORT HIGH INTENSITY LASERS FOR THE VISIBLE SPECTRA RANGE ». Periódico Tchê Química 17, no 35 (20 juillet 2020) : 739–52. http://dx.doi.org/10.52571/ptq.v17.n35.2020.63_abdulrahman_pgs_739_752.pdf.

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Ultra-short laser pulses are particularly suitable for processing micro tools made of ultra-hard and dielectric materials. Ultra-short laser pulses provide a contact-free and precise fabrication of heat-sensitive materials such as visible spectra range. Visible spectra range has unique properties, which makes it an essential material in the tool, jewelry, and semiconductor industries. The processing of visible spectra range by ultra-short laser pulses is complex, as visible and near-infrared light is generally not absorbed. However, the intensity of ultra-short laser pulses is extremely high, so that the absorption scales nonlinearly with the intensity and, thus, visible or near-infrared light can be absorbed. The complexity also results from many partially interdependent process variables, such as the repetition rate, pulse overlap, track overlap, and scan speed. Excellent knowledge of the process is, therefore, essential for the production of micro tools. To make the laser processing accessible to a broader user field, the operator can be supported by a computer-aided design (CAD). The aim of this research was to the modeling of an ultra-short high-intensity laser for the visible spectra range in different environments of the angle of incidence, scanning speed, pulse, and track overlap. The experimental process included ultra-short pulsed laser processing of visible spectra range and surface analysis concerning modifications and ablation of the ultra-short laser. Ablation volumes were analyzed for single pulses, multi-pulses, and pockets. Pump-probe experiments reveal transient optical properties such as transmission or reflectivity. It was concluded that ultraviolet laser pulses are best suited to induce damage or modifications to visible spectra range surfaces. Additionally, shorter wavelengths have further advantages such as potentially longer Rayleigh lengths and smaller spot sizes.
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Janutka, Andrzej. « Collisions of optical ultra-short vector pulses ». Journal of Physics A : Mathematical and Theoretical 41, no 28 (19 juin 2008) : 285204. http://dx.doi.org/10.1088/1751-8113/41/28/285204.

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NAKAGAWA, Kiyoshi, et Masatoshi SARUWATARI. « Application of ultra-short optical pulses to optical communication. » Review of Laser Engineering 15, no 11 (1987) : 1003–10. http://dx.doi.org/10.2184/lsj.15.1003.

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Mounir, Khelladi. « ANALYSIS OF ULTRAHSORT LASER PULSES PROPAGATION IN MEDIUM : LITHARGE GLASS SF56A ». International Journal of Research -GRANTHAALAYAH 7, no 2 (28 février 2019) : 58–67. http://dx.doi.org/10.29121/granthaalayah.v7.i2.2019.994.

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Propagation of an ultra-short lasers pulses in a linear optical medium consisting of free space, dispersive media. However, analytical methods have the limitations of not being able to handle arbitrary pulse profiles. Also, closed form solutions are often obtained after certain levels of approximations. This has motive a few studies based on the use of numerical simulation techniques in the analysis of pulse propagation. In view of the recent advance in ultra-short pulse propagation, a strong need is felt for developing a numerical formalism capable of performing such a complete analysis of the issues involved in pulse propagation. This allows us to analyze the pulse in the time-frequency domain at any arbitrary plane. With this tool, we investigate the spectral and temporal evolution of ultra-short pulses at any arbitrary propagation distance.
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Neyra, Enrique G., Gustavo A. Torchia, Pablo Vaveliuk et Fabian Videla. « Simple interferometric setup enabling sub-Fourier-scale ultra-short laser pulses ». Journal of Optics 24, no 4 (8 mars 2022) : 045504. http://dx.doi.org/10.1088/2040-8986/ac432c.

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Abstract In this work, we describe an interferometric method to generate ultra-short pulses below the Fourier limit. It is done by extending concepts first developed in the spatial domain to achieve sub-diffractive beams through the addition of a spatial chirp in one of the arms of a Michelson interferometer using a spherical mirror. To experimentally synthesize sub-Fourier pulses, we replace the spherical mirror with a water cell, since it produces chirp in the temporal domain. We also present an alternative procedure, based on asymmetrical interference between the widened pulse and the original pulse where the peaks of both pulses exhibit a temporal delay achieving the narrowing of ultra-short pulses with sub-Fourier scales. To characterize the performance of the system, we performed a preliminary assessment considering the percentage of full width at half-maximum shrinking obtained for each scheme. By means of a symmetrical configuration, 7% and 12% pulse reductions were verified, both experimentally and analytically, while for the non-symmetrical configuration, 10% and 24% reductions were achieved corresponding to main lobe to side-lobe ratios of 10% and 30%. The experimental setup scheme is simple, versatile and able to work with high-power laser sources and ultra-short pulses with a broad bandwidth at any central wavelength. The results presented in this work are promising and help to enlighten new routes and strategies in the design of coherent control systems. We envision that they will become broadly useful in different areas from strong field domain to quantum information.
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André, Jean-Michel, et Philippe Jonnard. « Ultra-short and ultra-intense X-ray free-electron laser single pulse in one-dimensional photonic crystals ». Journal of Synchrotron Radiation 24, no 2 (16 février 2017) : 376–85. http://dx.doi.org/10.1107/s1600577517000820.

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The propagation within a one-dimensional photonic crystal of a single ultra-short and ultra-intense pulse delivered by an X-ray free-electron laser is analysed with the framework of the time-dependent coupled-wave theory in non-linear media. It is shown that the reflection and the transmission of an ultra-short pulse present a transient period conditioned by the extinction length and also the thickness of the structure for transmission. For ultra-intense pulses, non-linear effects are expected: they could give rise to numerous phenomena, bi-stability, self-induced transparency, gap solitons, switching, etc., which have been previously shown in the optical domain.
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LEE, C. C., T. R. SCHIBLI, G. ACOSTA et J. S. BUNCH. « ULTRA-SHORT OPTICAL PULSE GENERATION WITH SINGLE-LAYER GRAPHENE ». Journal of Nonlinear Optical Physics & ; Materials 19, no 04 (décembre 2010) : 767–71. http://dx.doi.org/10.1142/s021886351000573x.

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Pulses as short as 260 fs have been generated in a diode-pumped low-gain Er:Yb: glass laser by exploiting the nonlinear optical response of single-layer graphene. The application of this novel material to solid-state bulk lasers opens up a way to compact and robust lasers with ultrahigh repetition rates.
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Chi, J., A. Als et Z. F. Ghassemlooy. « Evolution of ultra-short optical pulses in active DFB waveguides ». Journal de Physique IV (Proceedings) 12, no 5 (juin 2002) : 187–88. http://dx.doi.org/10.1051/jp4:20020127.

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Schäfer, T., et C. E. Wayne. « Propagation of ultra-short optical pulses in cubic nonlinear media ». Physica D : Nonlinear Phenomena 196, no 1-2 (septembre 2004) : 90–105. http://dx.doi.org/10.1016/j.physd.2004.04.007.

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Jiang, Xiance, Jianchu Liang, Jianzhong Cao, Jinxiang Song et Zebin Cai. « Chirp-free ultra-short pulses in complex nonlinear optical fibers ». Optics Communications 364 (avril 2016) : 110–14. http://dx.doi.org/10.1016/j.optcom.2015.10.034.

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Thèses sur le sujet "Ultra-short optical pulses"

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Parmigiani, Francesca. « Processing of ultra-short optical pulses for high bit-rate optical communications ». Thesis, University of Southampton, 2006. https://eprints.soton.ac.uk/65525/.

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In this thesis, the possibility of integrating linear pulse shapers into various all-optical signal processing devices for applications in high speed optical communication systems, to enhance the overall system performance, is investigated. The linear pulse shaping is performed using superstructured fibre Bragg gratings, which seem very promising passive devices for such application due to their compactness, easy integrability and compatibility with fibre based devices. At the same time, optical switching is facilitated by nonlinear effects in state of the art highly nonlinear fibres. The generation and manipulation of waveforms with specific shapes also requires suitable techniques for their precise characterization. For this reason, optical sampling oscilloscope or linear and nonlinear frequency resolved optical gating techniques are presented in this thesis. As a first example of all optical signal processing using pre-shaped pulses, the incident noisy data pulses are expanded into rectangular pulses at the input port of a nonlinear optical switch (nonlinear optical loop mirror). The flat top of the shaped pulses allows for the mitigation of any mistiming of the original signal across a time window defined by their width, simply by switching them with shorter clean clock pulses. By using a nonlinear switch with full regenerative properties as well, it is demonstrated that amplitude noise reduction as well as timing jitter reduction can be achieved in a single nonlinear switch. In a different switch configuration, where cross-phase modulation is utilized in a single-pass configuration, retiming is obtained by preshaping clean control pulses into pulses with a parabolic shape. XPM induced by such pulses can provide linear frequency-shifting to shorter mistimed data pulses across a temporal window corresponding to the full width of the parabolic pulses. This frequency-shift is proportional to the relative pulse displacement from the control bit-slot centre. Propagation in a suitable length of a dispersive medium can then be used to correct for the mistiming. The parabolic pulse shape is also very interesting for nonlinear propagation in normal-dispersion fibres, since it can propagate at high peak powers without undergoing deleterious pulse distortion (avoiding wave-breaking effects). It is demonstrated that the nonlinearly broadened parabolic pulse spectrum is highly flat and coherent, with a high spectral density, as required for spectral slicing or pulse compression applications. Finally, the use of Bismuth oxide highly nonlinear fibre is investigated in order to enhance the compactness and stability of the switching system. 2R-regeneration at 10- and 40-Gb/s is demonstrated using just 2 m of this fibre.
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Xia, Mo. « Ultra-short optical pulse generation from semiconductor diode emitters ». Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609419.

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Deutschmann-Olek, Andreas [Verfasser]. « Modeling and Control of Optical Pulse Amplifiers for Ultra-Short Laser Pulses / Andreas Deutschmann-Olek ». Düren : Shaker, 2021. http://d-nb.info/1233547895/34.

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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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Weig, Thomas [Verfasser], et Ulrich T. [Akademischer Betreuer] Schwarz. « Generation of optical ultra–short pulses in (Al,In)GaN laser diodes ». Freiburg : Universität, 2015. http://d-nb.info/111499636X/34.

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SEIXAS, DANIELE LUISE ALVES. « ULTRA-SHORT OPTICAL PULSES GENERATION USING RATIONAL MODE-LOCKING IN FIBER LASERS ». PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2000. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=7488@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
Neste trabalho descreve-se a geração de pulsos ópticos curtos estáveis, com durações na faixa de alguns psicossegundos, e diversas taxas de repetição. Para isto foi construído um laser a fibra dopada com érbio, na configuração em anel e operando nos regimes de mode- locking ativo harmônico e racional (MLEFL). As características temporal e espectral dos pulsos são estudadas. Os pulsos de saída apresentam potência de pico elevada e são limitados pela transformada, ou seja, na forma de sólitons. Esses pulsos são extremamente adequados para sistemas de comunicações solitônicos. Os lasers a fibra dopada com érbio operando no regime de mode-locking ativo (MLEFL), têm-se mostrado como um dos candidatos mais promissores para os sistemas solitônicos. Isto se deve ao fato desses dispositivos além de produzirem pulsos ultracurtos e com as características necessárias a esses sistemas, eles apresentam alta potência de saída e possibilitam a variação da taxa de repetição. Para a montagem desses lasers de forma razoavelmente compacta são utilizados componentes ópticos, tais como controladores de polarização, filtros e moduladores, em versões integradas (pigtailed) e já disponíveis comercialmente.
This work describes a simple and stable harmonically mode- locked erbium-doped fiber ring laser, that produces high power, ~ 1 ps transform-limited sech optical pulses. Pulse trains with different high repetition rates were obtained using harmonic mode-locking and rational harmonic mode- locking techniques. The temporal and spectral characteristics of the pulses are studied. The pulses are extremely appropriate for soliton based systems communications. Actively mode-locked erbium doped fiber ring lasers (MLEFL), have attracted much attention and are one of most promising candidates for soliton systems. This is due to some characteristics which are very convenient for high capacity optical systems: they can produce very short transform limited optical pulses at gigahertz rates. Such lasers also present high output powers, long term stability and can be easily tuned to operate in a wide region of wavelengths.
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Holmgren, Stefan. « Short Pulses in Engineered Nonlinear Media ». Doctoral thesis, KTH, Fysik, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4234.

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Short optical pulses and engineered nonlinear media is a powerful combination. Mode locked pulses exhibit high peak powers and short pulse duration and the engineered ferro-electric KTiOPO4 facilitates several different nonlinear processes. In this work we investigate the use of structured, second-order materials for generation, characterization and frequency conversion of short optical pulses. By cascading second harmonic generation and difference frequency generation the optical Kerr effect was emulated and two different Nd-based laser cavities were mode locked by the cascaded Kerr lensing effect. In one of the cavities 2.8 ps short pulses were generated and a strong pulse shortening took place through the interplay of the cavity design and the group velocity mismatch in the nonlinear crystal. The other laser had a hybrid mode locking scheme with active electro-optic modulation and passive cascaded Kerr lensing incorporated in a single partially poled KTP crystal. The long pulses from the active modulation were shortened when the passive mode locking started and 6.9 ps short pulses were generated. High-efficiency frequency conversion is not a trivial task in periodically poled materials for short pulses due to the large group velocity mismatch. Optimization of parameters such as the focussing condition and the crystal temperature allowed us to demonstrate 64% conversion efficiency by frequency doubling the fs pulses from a Yb:KYW laser in a single pass configuration. Quasi phase matching also offers new possibilities for nonlinear interactions. We demonstrated that it is possible to simultaneously utilize several phase matched second harmonic interactions, resulting in a dual-polarization second harmonic beam. Short pulse duration of the fundamental wave is a key parameter in the novel method that we demonstrated for characterization of the nonlinearity of periodically poled crystals. The method utilizes the group velocity mismatch between the two polarizations in a type II second harmonic generation configuration. The domain walls of PPKTP exhibit second order nonlinearities that are forbidden in the bulk material. This we used in a single shot frequency resolved optical gating arrangement. The spectral resolution came from Čerenkov phase matching, a non-collinear phase matching scheme that exhibits a substantial angular dispersion. The second harmonic light was imaged upon a CCD camera and with the spectral distribution on one axis and the temporal autocorrelation on the other. From this image we retrieved the full temporal profile of the fundamental pulse, as well as the phase. The spectral dispersion provided by the Čerenkov phase matching was large enough to characterize optical pulses as long as ~200 fs in a compact setup. The Čerenkov frequency resolved optical gating method samples a thin stripe of the beam, i.e. the area close to the domain wall. This provides the means for high spatial resolution measurements of the spectral-temporal characteristics of ultrafast optical fields.
QC 20100831
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Semaan, Georges. « Soliton dynamics in fiber lasers : from dissipative soliton to dissipative soliton resonance ». Thesis, Angers, 2017. http://www.theses.fr/2017ANGE0029/document.

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Dans cette thèse, nous étudions expérimentalement la génération d'impulsions carrées très énergétiques et accordable à l’échelle nanosecondes et d'impulsions ultracourtes à haute puissance moyenne de sortie dans les lasers à fibre utilisant les nanomatériaux comme absorbant saturable. Tout d'abord, puisque la dynamique des impulsions est dominée par l'interaction de la non linéarité et de la dispersion chromatique cubique de la fibre avec un mécanisme de discrimination d'intensité appelé absorbant saturable, la stabilité d'une distribution harmonique en mode verrouillé est étudiée par injection externe d'une onde continue.Enfin, nous avons utilisés des absorbant saturable à base de nanomatériaux déposés sur des tapers optiques dans les lasers à fibre pour générer des impulsions ultracourtes avec une puissance de sortie moyenne élevée
In this thesis, we investigate experimentally the generation of high energy nanosecond tunable square pulses and high output power ultrashort pulses in fiber lasers. First, since pulse dynamics are dominated by the interaction of the fiber's cubic Kerr nonlinearity and chromatic dispersion with an intensity-discriminating mechanism referred to as a saturable absorber, the stability of a harmonic mode-locked distribution is studied by external injection of a continuous wave. Finally, we implemented nanomaterial based saturable absorbers in fiber laser configuration to generate ultrashort pulses with high average output power. Different techniques of achieving such components are explicitly detailed: ultrashort pulse generation in ring cavities where graphene and topological insulators are deposited on optical tapers to form a saturable absorber
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Saint-Jalm, Sarah. « Sources optiques fibrées solitoniques pour la spectroscopie et la microscopie non linéaires ». Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4353/document.

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Un des problèmes à résoudre lors de la réalisation d'un endoscope non linéaire pour des applications biomédicales concerne la propagation d'impulsions ultra courtes dans une fibre optique. Les processus non linéaires concernés nécessitent de grandes puissances d'excitation, réalisables seulement pour des impulsions de très courte durée qui sont déformés et allongés par la dispersion et les non linéarités des fibres. La plupart des techniques d'illumination fibrées pour la microscopie non linéaire emploient des systèmes de pré-compensation pour neutraliser les effets de ces phénomènes. Dans ce travail, nous explorons les possibilités offertes par la formation de solitons de grande énergie dans une fibre à bandes interdites photoniques à coeur solide. Les solitons optiques ont la propriété de conserver leur forme lors de leur propagation, et leur durée reste proche de la valeur minimum définie par la limite physique imposée par leur largeur spectrale, sans avoir besoin de recourir à un système de pré-compensation. De plus, la longueur d'onde et le retard relatif des solitons peuvent être accordés en changeant la puissance lumineuse en entrée de fibre. Plusieurs sources de lumière ont été conçues et réalisées, pour générer de nombreux contrastes non linéaires. Des images d'échantillons biologiques ont d'abord été réalisées en tirant profit de la courte durée des solitons. Puis, des mesures d'absorption transitoire ont été menées dans une configuration pompe-sonde en contrôlant le retard des solitons dans la fibre. Enfin, un montage de CRS basé sur le principe de focalisation spectrale a été réalisé, et son utilité a été démontrée en suivant un équilibre chimique
One of the issues that has to be overcome to realize a nonlinear endoscope for biomedical applications is the propagation of ultra-short pulses in an optical fiber. Nonlinear processes require high peak powers in the focal volume in order to generate observable signals, so the pulses should be as short as possible. This makes them sensitive to the dispersion and nonlinearities of the fibers. Most of the existing techniques of ultra-short pulses fiber-delivery rely on complex pre-compensation systems to counteract these effects. In this work, we explore the possibilities offered by the generation of high-energy solitons in a custom-built solid-core photonic bandgap fiber, for nonlinear microscopy and spectroscopy. Optical solitons preserve their shape when they propagate in a fiber, and their duration remains close to the minimum value physically allowed by their bandwidth, without the need of any pre-compensation. Moreover, the wavelength and delay of the soliton can be tuned by changing the power at the input of the fiber. Several soliton-based light sources were designed and realized, generating contrast in the most prevalent nonlinear microscopy modalities. TPEF and SHG images of biological samples were first realized by taking advantage of the short duration of the solitons. By controlling the delay of the soliton, transient absorption measurements were then realized in a pump-probe configuration. Finally, the wavelength tunability of the soliton was used to generate the Stokes beam in a CRS setup based on the spectral focusing technique. The capabilities of this scheme were demonstrated by performing CRS microspectroscopy to monitor a chemical equilibrium
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Chorel, Marine. « Étude des traitements multicouches utilisés dans un environnement à faible hygrométrie sur les installations laser de puissance ». Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0188/document.

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L’amplification par dérive de fréquence démontrer en 1985 a permis la création d’installations laser en impulsions courtes tels que Petal (Petawatt Aquitaine Laser). La montée en puissance de ces lasers est limitée par la résistance au flux laser des composants placés après la compression. L’objectif de cette thèse est d’améliorer la résistance au flux laser de ces composants qui sont des miroirs qui consiste en un empilement multicouches. Trois approches sont envisagées le changement de designs des empilements couches minces (nombre de couche, épaisseurs), de matériaux et/ou de procédés de fabrication. Une étude numérique a permis d’envisager théoriquement le changement de matériaux et/ou de design et de quantifier les améliorations possibles. Cette étude a mené au développement d’un algorithme d’optimisation des designs qui nécessite la caractérisation préalable des matériaux. Par conséquent, une variété de matériaux déposés en monocouches a été testée au flux laser et caractérisé optiquement pour évaluer l’adéquation matériaux et technique de dépôt. Les résultats obtenus montrent une forte dispersion qui ne peut être expliqué par des lois préalablement établi dans la littérature. Cependant, une bonne corrélation entre le seuil de tenue au flux laser intrinsèque dans l’infrarouge et l’absorption dans l’ultraviolet a été observé ce qui confirme l’influence de l’absorption multi-photonique sur l’endommagement laser en impulsions courtes. Pour finir, l’ensemble de ces résultats expérimentaux et de l’algorithme d’optimisation ont permis la fabrication d’échantillons de miroirs qui montrent une amélioration du seuil de tenue au flux laser de 73% par rapport à des miroirs quart d’onde classiques
The chirped pulse amplification demonstrated in 1985 allowed the development of petawatt class laser such as Petal (Petawatt Aquitaine Laser). The increase of power of those facilities is limited by the resistance to laser-induced damage of the optical components placed after the compression stage. The aim of this thesis is to improve the laser-induced damage threshold of those components which are multilayer dielectric mirrors. Three paths of improvement are considered the change of design (number of layer, thicknesses), of materials and/or deposition process. A numerical study allows evaluating the potential improvement brought by two of those paths. This led to the development of a design optimization algorithm that required the prior characterization materials. Consequently, various materials deposited as single layers were laser damage tested and optically characterized to evaluate the adequacy of the materials with the deposition process. The results show a wide discrepancy that cannot be explained by the laws exposed in the literature. However, a good correlation was found between the intrinsic laser-induced damage thresholds in the infrared with the absorption in the ultraviolet confirming the influence of the multiphoton absorption in the laser-induced damage mechanisms. Finally, those experimental results combined with the optimization algorithm allowed the development of mirror samples that exhibit laser-induced damage threshold 73% higher than one of classical mirrors
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Livres sur le sujet "Ultra-short optical pulses"

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Sadegh Amiri, Iraj, et Harith Ahmad. Optical Soliton Communication Using Ultra-Short Pulses. Singapore : Springer Singapore, 2015. http://dx.doi.org/10.1007/978-981-287-558-7.

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Stalmashonak, Andrei. Ultra-Short Pulsed Laser Engineered Metal-Glass Nanocomposites. Heidelberg : Springer International Publishing, 2013.

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Frank, Sabath, dir. Ultra-wideband, short-pulse electromagnetics. New York : Springer, 2010.

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Conference on Ultra-Wideband, Short-Pulse Electromagnetics (7th 2004 Magdeburg, Germany). Ultra-wideband short-pulse electromagnetics 7. New York : Springer, 2007.

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Amiri, Iraj Sadegh, et Harith Ahmad. Optical Soliton Communication Using Ultra-Short Pulses. Springer, 2015.

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Amiri, Iraj Sadegh, et Harith Ahmad. Optical Soliton Communication Using Ultra-Short Pulses. Springer London, Limited, 2015.

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Amiri, Iraj Sadegh, et Harith Ahmad. Optical Soliton Communication Using Ultra-Short Pulses. Springer, 2015.

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Abdolvand, Amin, Gerhard Seifert et Andrei Stalmashonak. Ultra-Short Pulsed Laser Engineered Metal-Glass Nanocomposites. Springer International Publishing AG, 2013.

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(Editor), Carl E. Baum, Alexander P. Stone (Editor) et J. Scott Tyo (Editor), dir. Ultra-Wideband Short-Pulse Electromagnetics 8. Springer, 2007.

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Chapitres de livres sur le sujet "Ultra-short optical pulses"

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Sadegh Amiri, Iraj, et Harith Ahmad. « Optical Soliton Signals Propagation in Fiber Waveguides ». Dans Optical Soliton Communication Using Ultra-Short Pulses, 1–11. Singapore : Springer Singapore, 2015. http://dx.doi.org/10.1007/978-981-287-558-7_1.

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Sadegh Amiri, Iraj, et Harith Ahmad. « Ultra-Short Solitonic Pulses Used in Optical Communication ». Dans Optical Soliton Communication Using Ultra-Short Pulses, 47–51. Singapore : Springer Singapore, 2015. http://dx.doi.org/10.1007/978-981-287-558-7_4.

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Sadegh Amiri, Iraj, et Harith Ahmad. « MRR Systems and Soliton Communication ». Dans Optical Soliton Communication Using Ultra-Short Pulses, 13–30. Singapore : Springer Singapore, 2015. http://dx.doi.org/10.1007/978-981-287-558-7_2.

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Sadegh Amiri, Iraj, et Harith Ahmad. « Solitonic Signals Generation and Transmission Using MRR ». Dans Optical Soliton Communication Using Ultra-Short Pulses, 31–46. Singapore : Springer Singapore, 2015. http://dx.doi.org/10.1007/978-981-287-558-7_3.

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Vanagas, E. A., et A. I. Maimistov. « Nonlinear Propagation of Ultra-short Optical Pulses in Activated Fibers ». Dans Springer Proceedings in Physics, 157–61. Berlin, Heidelberg : Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-75826-3_31.

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Deiterding, Ralf, et Stephen W. Poole. « Robust Split-Step Fourier Methods for Simulating the Propagation of Ultra-Short Pulses in Single- and Two-Mode Optical Communication Fibers ». Dans Splitting Methods in Communication, Imaging, Science, and Engineering, 603–25. Cham : Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-41589-5_18.

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Stenz, C., F. Blasco, J. Stevefelt, J. C. Pellicer, A. Antonetti, J. P. Chambaret, G. Chériaux et al. « Observation of Relativistic Self-Focusing, Self-Channeling and Filamentation of Multiterawatt Ultra-Short Laser Pulses in Optical-Field Ionized Argon Gas Jets ». Dans Springer Series in Chemical Physics, 115–16. Berlin, Heidelberg : Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-80314-7_48.

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Ledingham, Ken W. D. « Applications of Ultra-Intense, Short Laser Pulses ». Dans Ultrafast Nonlinear Optics, 227–49. Heidelberg : Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-00017-6_10.

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Zhang, X. C., Y. Jin, T. D. Hewitt, T. Sangsiri, L. Kingsley et M. Weiner. « Terahertz Radiation from Electro-Optic Crystals ». Dans Ultra-Wideband, Short-Pulse Electromagnetics, 21–27. Boston, MA : Springer US, 1993. http://dx.doi.org/10.1007/978-1-4615-2870-8_3.

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Angell, T. S., R. E. Kleinman et B. Vainberg. « Asymptotic Approximations for Optimal Conformal Antennas ». Dans Ultra-Wideband, Short-Pulse Electromagnetics 3, 177–83. Boston, MA : Springer US, 1997. http://dx.doi.org/10.1007/978-1-4757-6896-1_21.

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Actes de conférences sur le sujet "Ultra-short optical pulses"

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Fuchs, Ulrike, Uwe D. Zeitner et Andreas Tünnermann. « Optics for focusing of ultra-short laser pulses ». Dans Optical Systems Design 2005, sous la direction de Laurent Mazuray et Rolf Wartmann. SPIE, 2005. http://dx.doi.org/10.1117/12.625071.

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Xie, Xiaopeng, Romain Bouchand, Daniele Nicolodi, Michel Lours, Yann Le Coq, Pierre-Alain Tremblin, Giorgio Santarelli et al. « Ultra-short optical pulses leading to ultra-stable photonic microwave generation ». Dans 2017 Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFC). IEEE, 2017. http://dx.doi.org/10.1109/fcs.2017.8089034.

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Wang, Hongcheng, Jianchu Liang, Guihua Chen et Dongxiong Ling. « Ultra-short pulses in optical fibers with complex parameters ». Dans International Symposium on Photonics and Optoelectronics (SOPO 2014), sous la direction de Zhiping Zhou. SPIE, 2014. http://dx.doi.org/10.1117/12.2066639.

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Huettner, Bernd. « Modifications of optical properties by ultra short laser pulses ». Dans International Symposium on High-Power Laser Ablation 2002, sous la direction de Claude R. Phipps. SPIE, 2002. http://dx.doi.org/10.1117/12.482106.

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Asano, Takashi, et Susumu Noda. « Ultra-high-Q Photonic Nanocavities and Trapping of Ultra-short Optical Pulses ». Dans Slow and Fast Light. Washington, D.C. : OSA, 2006. http://dx.doi.org/10.1364/sl.2006.mb4.

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Onori, D., F. Scotti, G. Serafino, P. Ghelfi et A. Bogoni. « Ultra-short optical pulses for coherent ultra-wide band RF signal sampling ». Dans CLEO : Science and Innovations. Washington, D.C. : OSA, 2018. http://dx.doi.org/10.1364/cleo_si.2018.sth4n.3.

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Ramachandran, S., J. W. Nicholson et M. F. Yan. « Novel Fibers for Ultra-Short and High-Power Pulses ». Dans OFC/NFOEC 2007 - 2007 Conference on Optical Fiber Communication and the National Fiber Optic Engineers Conference. IEEE, 2007. http://dx.doi.org/10.1109/ofc.2007.4348881.

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Verit, Isabel, Claire RIGOTHIER, Laura GEMINI, Julie PRETERRE, Clémentine JAVAUX, Jean-Christophe FRICAIN et Rainer KLING. « Biofabrication of a vascular capillary by ultra-short laser pulses ». Dans Optical Interactions with Tissue and Cells XXX, sous la direction de Hope T. Beier et Bennett L. Ibey. SPIE, 2019. http://dx.doi.org/10.1117/12.2509754.

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Horak, P., et F. Poletti. « Nonlinear mode coupling of ultra-short pulses in optical Fibers ». Dans 2009 IEEE/LEOS Winter Topicals Meeting Series (WTM 2009). IEEE, 2009. http://dx.doi.org/10.1109/leoswt.2009.4771712.

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Rodriguez-Silva, Bryan Alejandro, Carlos Moises Carrillo-Delgado, Juan Carlos Hernandez-Garcia, Julián Moises Estudillo-Ayala, Daniel Jáuregui-Vázquez, Juan Manuel Sierra-Hernández et Roberto Rojas-Laguna. « Photochemical decomposition of uric acid crystals by ultra-short laser pulses ». Dans Optical Interactions with Tissue and Cells XXXI, sous la direction de Bennett L. Ibey et Norbert Linz. SPIE, 2020. http://dx.doi.org/10.1117/12.2546099.

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