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Articles de revues sur le sujet « Coherent optical pulses »

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Auteur : Grafiati
Publié le 11 mars 2023

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1

SHARABY, Y. A., A. JOSHI et S. S. HASSAN. « COHERENT POPULATION TRANSFER IN V-TYPE ATOMIC SYSTEM ». Journal of Nonlinear Optical Physics & ; Materials 22, no 04 (décembre 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 et Shangqing Gong. « External Modulation Optical Coherent Domain Reflectometry with Long Measurement Range ». Sensors 21, no 16 (16 août 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 et 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., et D. N. Bezbat’ko. « Coherent phonons excited by two optical pulses ». Physics of the Solid State 58, no 2 (février 2016) : 333–35. http://dx.doi.org/10.1134/s106378341602027x.

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5

Jeong, Heejeong, et Ulf Österberg. « Coherent transients : optical precursors and 0π pulses ». Journal of the Optical Society of America B 25, no 7 (28 mars 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 (30 juin 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 et 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 et 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 (12 octobre 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 et Alexei V. Sokolov. « Generation of Ultrafast Optical Pulses via Molecular Modulation in Ambient Air ». Applied Sciences 9, no 12 (20 juin 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 et 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 (5 avril 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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11

Jiang, Shicheng, et Konstantin Dorfman. « Detecting electronic coherences by time-domain high-harmonic spectroscopy ». Proceedings of the National Academy of Sciences 117, no 18 (16 avril 2020) : 9776–81. http://dx.doi.org/10.1073/pnas.1919360117.

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Ultrafast spectroscopy is capable of monitoring electronic and vibrational states. For electronic states a few eV apart, an X-ray laser source is required. We propose an alternative method based on the time-domain high-order harmonic spectroscopy where a coherent superposition of the electronic states is first prepared by the strong optical laser pulse. The coherent dynamics can then be probed by the higher-order harmonics generated by the delayed probe pulse. The high nonlinearity typically modeled by the three-step mechanism introduced by Lewenstein and Corkum can serve as a recipe for generation of the coherent excitation with broad bandwidth. The main advantage of the method is that only optical (non–X-ray) lasers are needed. A semiperturbative model based on the Liouville space superoperator approach is developed for the bookkeeping of the different orders of the nonlinear response for the high-order harmonic generation using multiple pulses. Coherence between bound electronic states is monitored in the harmonic spectra from both first- and second-order responses.
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12

Weiner, A. M., J. P. Heritage et R. N. Thurston. « Synthesis of phase-coherent, picosecond optical square pulses ». Optics Letters 11, no 3 (1 mars 1986) : 153. http://dx.doi.org/10.1364/ol.11.000153.

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13

Merkel, K. D., et W. R. Babbitt. « Coherent transient optical signal processing without brief pulses ». Applied Optics 35, no 2 (10 janvier 1996) : 278. http://dx.doi.org/10.1364/ao.35.000278.

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14

Boscolo, Sonia, et Christophe Finot. « Nonlinear Pulse Shaping in Fibres for Pulse Generation and Optical Processing ». International Journal of Optics 2012 (2012) : 1–14. http://dx.doi.org/10.1155/2012/159057.

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The development of new all-optical technologies for data processing and signal manipulation is a field of growing importance with a strong potential for numerous applications in diverse areas of modern science. Nonlinear phenomena occurring in optical fibres have many attractive features and great, but not yet fully explored, potential in signal processing. Here, we review recent progress on the use of fibre nonlinearities for the generation and shaping of optical pulses and on the applications of advanced pulse shapes in all-optical signal processing. Amongst other topics, we will discuss ultrahigh repetition rate pulse sources, the generation of parabolic shaped pulses in active and passive fibres, the generation of pulses with triangular temporal profiles, and coherent supercontinuum sources. The signal processing applications will span optical regeneration, linear distortion compensation, optical decision at the receiver in optical communication systems, spectral and temporal signal doubling, and frequency conversion.
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15

Pääkkönen, Pertti, Jari Turunen, Pasi Vahimaa, Ari T. Friberg et Frank Wyrowski. « Partially coherent Gaussian pulses ». Optics Communications 204, no 1-6 (avril 2002) : 53–58. http://dx.doi.org/10.1016/s0030-4018(02)01240-3.

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16

Полтавцев, С. В., И. А. Югова, И. А. Акимов, Д. Р. Яковлев et M. Bayer. « Фотонное эхо на локализованных экситонах в полупроводниковых наноструктурах ». Физика твердого тела 60, no 8 (2018) : 1587. http://dx.doi.org/10.21883/ftt.2018.08.46254.17gr.

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AbstractAn overview on photon echo spectroscopy under resonant excitation of the exciton complexes in semiconductor nanostructures is presented. The use of four-wave-mixing technique with the pulsed excitation and heterodyne detection allowed us to measure the coherent response of the system with the picosecond time resolution. It is shown that, for resonant selective pulsed excitation of the localized exciton complexes, the coherent signal is represented by the photon echoes due to the inhomogeneous broadening of the optical transitions. In case of resonant excitation of the trions or donor-bound excitons, the Zeeman splitting of the resident electron ground state levels under the applied transverse magnetic field results in quantum beats of photon echo amplitude at the Larmor precession frequency. Application of magnetic field makes it possible to transfer coherently the optical excitation into the spin ensemble of the resident electrons and to observe a long-lived photon echo signal. The described technique can be used as a high-resolution spectroscopy of the energy splittings in the ground state of the system. Next, we consider the Rabi oscillations and their damping under excitation with intensive optical pulses for the excitons complexes with a different degree of localization. It is shown that damping of the echo signal with increase of the excitation pulse intensity is strongly manifested for excitons, while on trions and donor-bound excitons this effect is substantially weaker.
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17

Liu, Yuchen, Jian Yin, Xutang Tao, Arkady Yartsev et Pierre-Adrien Mante. « Effect of probe pulse duration in picosecond ultrasonics ». Applied Physics Letters 120, no 20 (16 mai 2022) : 202201. http://dx.doi.org/10.1063/5.0093321.

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Picosecond ultrasonics is a powerful tool for nanoscale metrology, giving access to dimensions and mechanical, thermal, and optical properties of nanomaterials. By monitoring the temporal evolution of the interaction of light with coherent acoustic phonons, also known as Brillouin oscillations, phonon lifetime and optical absorption can be measured. However, the extraction of these quantities can be inaccurate due to the common assumption of the infinite coherence length of probe pulses. Here, we demonstrate the effect of probe pulse duration on picosecond ultrasonic measurements numerically and experimentally. We establish a model that shows how the probe coherence length affects the measured signal loss and how we can overcome this limitation and measure an upper limit of the acoustic attenuation factor. The model is verified experimentally on a GaAs bulk substrate by varying the probe pulse duration, showing a strong effect for sub-100 fs pulses. Finally, we applied to CH3NH3PbBr3, where we reveal a high acoustic attenuation factor, which is in line with recent claims of strong anharmonicity in halide perovskites.
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18

Bai, Y. S., W. R. Babbitt et T. W. Mossberg. « Coherent transient optical pulse-shape storage/recall using frequency-swept excitation pulses ». Optics Letters 11, no 11 (1 novembre 1986) : 724. http://dx.doi.org/10.1364/ol.11.000724.

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19

Finkelstein, V., et P. R. Berman. « Optical coherent transients induced by time-delayed fluctuating pulses : Three-pulse transients ». Physical Review A 41, no 11 (1 juin 1990) : 6193–224. http://dx.doi.org/10.1103/physreva.41.6193.

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20

Panajotovic, Aleksandra, Daniela Milovic, Anjan Biswas et Essaid Zerrad. « Influence of Even-Order Dispersion on Super-Sech Soliton Transmission Quality under Coherent Crosstalk ». Research Letters in Optics 2008 (2008) : 1–5. http://dx.doi.org/10.1155/2008/613986.

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The transmission speed of optical network strongly depends on the impact of higher order dispersion. In presence of coherent crosstalk, which cannot be otherwise controlled by optical filtering, the impact of higher order dispersions becomes more pronounced. In this paper, the general expressions, that describe pulse deformation due to second- and fourth-order dispersions in a single-mode fiber, are given. The responses for such even-order dispersions, in presence of coherent crosstalk, are characterized by waveforms with long trailing edges. The transmission quality of optical pulses, due to both individual and combined influence of second- and fourth-order dispersions, is studied in this paper. Finally, the pulse shape and eye diagrams are obtained.
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21

Hasegawa, Takayuki. « Characteristics of Coherent Optical Phonons in a Hexagonal YMnO3 Thin Film ». Applied Sciences 9, no 4 (18 février 2019) : 704. http://dx.doi.org/10.3390/app9040704.

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This paper reviews our recent study on a coherent optical phonon in a hexagonal YMnO3 thin film together with related optical studies in hexagonal RMnO3 (R = Y, Lu, Ho) compounds. Coherent phonons have been observed in RMnO3 compounds by pump-probe spectroscopy with subpicosecond laser pulses, whereas the observation of coherent optical phonons was reported only in LuMnO3. Recently, we succeeded in the observation of the coherent optical phonon in a YMnO3 thin film. The generation process of the coherent optical phonon is assigned to a displacive mechanism, which is identical to that in LuMnO3. The coherent optical phonon is observed in the temperature range from 10 K to room temperature, while the oscillation intensity strongly decreases as the temperature increases to the Néel temperature of ~70 K from a lower temperature range. It is interesting that the temperature dependence is largely different from that in LuMnO3. We describe that the result can be qualitatively explained by the property of an isostructural transition around the Néel temperature in RMnO3 compounds. In addition, we briefly discuss ultrafast incoherent responses of excited electronic states from the viewpoint of the excitation photon energy of laser pulses.
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22

XU, SHUWU, YUNXIA HUANG et XIANMING JI. « SELECTIVE EXCITATION OF COHERENT ANTI-STOKES RAMAN SCATTERING VIA PHASE STEP MODULATION ». Journal of Nonlinear Optical Physics & ; Materials 22, no 01 (mars 2013) : 1350002. http://dx.doi.org/10.1142/s0218863513500021.

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It is known that femtosecond coherent anti-Stokes Raman scattering (CARS) method suffers from the drawback of poor selectivity between neighboring Raman energy levels due to the large bandwidth of the pulses. Quantum coherent control based on the ultrashort pulse shaping technique is a promising solution. In this paper, we propose a simple approach to realize the selective excitation of CARS spectra by shaping both the probe and pump pulses with the π phase step. By phase step modulation of the probe pulse, we show that the CARS signals between neighboring Raman energy levels can be greatly narrowed and differentiated, and then selective excitation can be realized by modulating both the probe and pump pulses. Finally, the mechanism of the selective excitation by population transfer is briefly discussed.
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23

Flöry, Tobias, Edgar Kaksis, Ignas Astrauskas, Tadas Balčiūnas, Audrius Pugžlys, Andrius Baltuška, Daniil Kartashov et al. « Direct time-domain shaping of high-energy femtosecond pulses at THz burst frequencies ». EPJ Web of Conferences 205 (2019) : 01017. http://dx.doi.org/10.1051/epjconf/201920501017.

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We generate fully controllable fs multimillijoule pulse bursts with the energy handling, throughput efficiency and frequency resolution substantially exceeding that achievable in spatial-light-modulator and interferometric techniques. The demonstrated proof-of-concept experiments include coherent control of nitrogen-ion emission via multiple-pulse excitation and generation of tunable narrowband THz pulses via optical rectification.
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24

Apretna, T., N. Nilforoushan, J. Tignon, S. Dhillon, F. Carosella, R. Ferreira, E. Lhuillier et J. Mangeney. « Coherent THz wave emission from HgTe quantum dots ». Applied Physics Letters 121, no 25 (19 décembre 2022) : 251101. http://dx.doi.org/10.1063/5.0134396.

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Mercury telluride (HgTe) nanocrystals (NCs) are very promising for THz technology as they exhibit broad THz absorption resonances and a carrier lifetime of a few picoseconds as well as being easily fabricated using solution synthesis. In this work, we show their light emission properties in the THz spectral range, up until now unexplored, and show how THz pulse generation can be used for microscopic insights into these NCs. In particular, we report on coherent THz emission from large HgTe NCs excited by linearly polarized optical pulses via second-order nonlinear effects. The peak emission frequency is tunable from 0.4 to 0.8 THz by varying incident angles of optical pulses from 0° to 45°. Our results reveal that the THz emission is induced by transient photocurrents arising from both photogalvanic and photon drag effects. By pushing the light emission of colloidal quantum dots down to the THz spectral range, our study expands the application fields of NCs, especially toward the development of easily integrable and tunable THz emitters and quantum THz devices.
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25

Halavanau, Aliaksei, Andrei Benediktovitch, Alberto A. Lutman, Daniel DePonte, Daniele Cocco, Nina Rohringer, Uwe Bergmann et Claudio Pellegrini. « Population inversion X-ray laser oscillator ». Proceedings of the National Academy of Sciences 117, no 27 (22 juin 2020) : 15511–16. http://dx.doi.org/10.1073/pnas.2005360117.

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Oscillators are at the heart of optical lasers, providing stable, transform-limited pulses. Until now, laser oscillators have been available only in the infrared to visible and near-ultraviolet (UV) spectral region. In this paper, we present a study of an oscillator operating in the 5- to 12-keV photon-energy range. We show that, using theKα1line of transition metal compounds as the gain medium, an X-ray free-electron laser as a periodic pump, and a Bragg crystal optical cavity, it is possible to build X-ray oscillators producing intense, fully coherent, transform-limited pulses. As an example, we consider the case of a copper nitrate gain medium generating ∼ 5 ×1010photons per pulse with 37-fs pulse length and 48-meV spectral resolution at 8-keV photon energy. Our theoretical study and simulation of this system show that, because of the very large gain per pass, the oscillator saturates and reaches full coherence in four to six optical-cavity transits. We discuss the feasibility and design of the X-ray optical cavity and other parts of the oscillator needed for its realization, opening the way to extend X-ray–based research beyond current capabilities.
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26

Talukder, Ria, Atri Halder, Matias Koivurova, Chaoliang Ding, Tero Setälä, Jari Turunen et Ari T. Friberg. « Generation of pulse trains with nonconventional temporal correlation properties ». Journal of Optics 24, no 5 (28 mars 2022) : 055502. http://dx.doi.org/10.1088/2040-8986/ac5c69.

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Abstract We apply time dependent spectral phase modulation to generate pulse trains that are spectrally and temporally partially coherent in an ensemble averaged sense. We consider, in particular, quadratic spectral phase modulation of Gaussian pulses, and demonstrate two particular types of nonuniformly correlated pulse trains. The controlled partial temporal coherence of the nonstationary fields is generated using a pulse compressor and experimentally verified with frequency resolved optical gating (FROG). We show that the correlation characteristics of such pulse trains can be retrieved directly from the FROG spectrograms provided one has certain a priori knowledge of the pulse train. Our results open a pathway for experimental confirmation of several correlation induced effects in the temporal domain.
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27

Christov, I. P. « Propagation of Partially Coherent Light Pulses ». Optica Acta : International Journal of Optics 33, no 1 (janvier 1986) : 63–72. http://dx.doi.org/10.1080/713821858.

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28

Heeg, Kilian P., Andreas Kaldun, Cornelius Strohm, Christian Ott, Rajagopalan Subramanian, Dominik Lentrodt, Johann Haber et al. « Coherent X-ray−optical control of nuclear excitons ». Nature 590, no 7846 (17 février 2021) : 401–4. http://dx.doi.org/10.1038/s41586-021-03276-x.

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AbstractCoherent control of quantum dynamics is key to a multitude of fundamental studies and applications1. In the visible or longer-wavelength domains, near-resonant light fields have become the primary tool with which to control electron dynamics2. Recently, coherent control in the extreme-ultraviolet range was demonstrated3, with a few-attosecond temporal resolution of the phase control. At hard-X-ray energies (above 5–10 kiloelectronvolts), Mössbauer nuclei feature narrow nuclear resonances due to their recoilless absorption and emission of light, and spectroscopy of these resonances is widely used to study the magnetic, structural and dynamical properties of matter4,5. It has been shown that the power and scope of Mössbauer spectroscopy can be greatly improved using various control techniques6–16. However, coherent control of atomic nuclei using suitably shaped near-resonant X-ray fields remains an open challenge. Here we demonstrate such control, and use the tunable phase between two X-ray pulses to switch the nuclear exciton dynamics between coherent enhanced excitation and coherent enhanced emission. We present a method of shaping single pulses delivered by state-of-the-art X-ray facilities into tunable double pulses, and demonstrate a temporal stability of the phase control on the few-zeptosecond timescale. Our results unlock coherent optical control for nuclei, and pave the way for nuclear Ramsey spectroscopy17 and spin-echo-like techniques, which should not only advance nuclear quantum optics18, but also help to realize X-ray clocks and frequency standards19. In the long term, we envision time-resolved studies of nuclear out-of-equilibrium dynamics, which is a long-standing challenge in Mössbauer science20.
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29

Châtelain, Benoît, Charles Laperle, Kim Roberts, Mathieu Chagnon, Xian Xu, Andrzej Borowiec, François Gagnon et David V. Plant. « A family of Nyquist pulses for coherent optical communications ». Optics Express 20, no 8 (27 mars 2012) : 8397. http://dx.doi.org/10.1364/oe.20.008397.

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30

Kozlov, Victor V., et Stefan Wabnitz. « Quasi-parabolic pulses in a coherent nonlinear optical amplifier ». Optics Letters 35, no 12 (10 juin 2010) : 2058. http://dx.doi.org/10.1364/ol.35.002058.

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31

Pryde, G. J., M. J. Sellars et N. B. Manson. « Solid State Coherent Transient Measurements Using Hard Optical Pulses ». Physical Review Letters 84, no 6 (7 février 2000) : 1152–55. http://dx.doi.org/10.1103/physrevlett.84.1152.

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32

Geddes III, Joseph B., Daniel L. Marks et Stephen A. Boppart. « Design of Matched Optical Pulses for Coherent Raman Imaging ». Optics and Photonics News 20, no 12 (1 décembre 2009) : 31. http://dx.doi.org/10.1364/opn.20.12.000031.

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33

Cheung, K. P., et D. H. Auston. « Excitation of Coherent Phonon Polaritons with Femtosecond Optical Pulses ». Physical Review Letters 55, no 20 (11 novembre 1985) : 2152–55. http://dx.doi.org/10.1103/physrevlett.55.2152.

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34

Minkovich, V. P., A. N. Starodumov, V. I. Borisov, V. I. Lebedev et S. N. Perepechko. « Temporal interference of coherent laser pulses in optical fibers ». Optics Communications 192, no 3-6 (juin 2001) : 231–35. http://dx.doi.org/10.1016/s0030-4018(01)01215-9.

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35

Mishina, Tomobumi, et Yasuaki Masumoto. « Nonlinear coherent propagation of femtosecond optical pulses in semiconductors ». Progress in Crystal Growth and Characterization of Materials 33, no 1-3 (janvier 1996) : 113–16. http://dx.doi.org/10.1016/0960-8974(96)83624-2.

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36

Liao, C., H. Y. Zhang et Y. Z. Gao. « New method for generation of coherent ultrashort optical pulses ». Electronics Letters 27, no 7 (1991) : 550. http://dx.doi.org/10.1049/el:19910347.

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TALANINA, I. B. « EXCITONIC SELF-INDUCED TRANSPARENCY IN SEMICONDUCTORS ». Journal of Nonlinear Optical Physics & ; Materials 05, no 01 (janvier 1996) : 51–57. http://dx.doi.org/10.1142/s0218863596000064.

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The form invariant coherent pulse propagation in semiconductors excited at 1s-exciton resonance is studied analytically using the reduced semiconductor Maxwell-Bloch equations. The sech-shaped pulse solution for excitonic self-induced transparency (SIT) is presented, showing significant difference in comparison with the well known SIT solution for non-interacting two-level systems. In contrast to 2π pulses in atomic systems, the phenomenon of SIT of interacting excitons in semiconductors occurs for the pulses of area 1.07π. Possible applications of the SIT solitons in semiconductor all-optical switching devices are discussed.
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38

Withington, Stafford, George Saklatvala et Michael Hobson. « Scattering coherent and partially coherent space-time pulses through few-mode optical systems ». Journal of the Optical Society of America A 23, no 11 (1 novembre 2006) : 2775. http://dx.doi.org/10.1364/josaa.23.002775.

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39

Kolbasova, Daria, et Robin Santra. « Analytical Theory of Attosecond Transient Absorption Spectroscopy of Perturbatively Dressed Systems ». Applied Sciences 9, no 7 (30 mars 2019) : 1350. http://dx.doi.org/10.3390/app9071350.

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A theoretical description of attosecond transient absorption spectroscopy for temporally and spatially overlapping XUV and optical pulses is developed, explaining the signals one can obtain in such an experiment. To this end, we employ a two-stage approach based on perturbation theory, which allows us to give an analytical expression for the transient absorption signal. We focus on the situation in which the attosecond XUV pulse is used to create a coherent superposition of electronic states. As we explain, the resulting dynamics can be detected in the spectrum of the transmitted XUV pulse by manipulating the electronic wave packet using a carrier-envelope-phase-stabilized optical dressing pulse. In addition to coherent electron dynamics triggered by the attosecond pulse, the transmitted XUV spectrum encodes information on electronic states made accessible by the optical dressing pulse. We illustrate these concepts through calculations performed for a few-level model.
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40

GUPTA, J. A., D. D. AWSCHALOM, R. KNOBEL et N. SAMARTH. « ULTRAFAST MANIPULATION OF ELECTRON SPIN COHERENCE IN QUANTUM WELLS ». International Journal of Modern Physics B 16, no 20n22 (30 août 2002) : 2930–35. http://dx.doi.org/10.1142/s0217979202013237.

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A recently developed technique is reviewed with the potential for all-optical coherent control over electron spins in semiconductors. In these experiments, ultrafast laser pulses "tip" electron spins by generating effective magnetic fields via the optical Stark effect. Measurements of Stark shifts have provided estimates of the net tipping angle as a function of tipping pulse energy, intensity, and polarization. Background contributions to the measured tipping angle arise from the undesirable excitation of additional carriers by the tipping pulse.
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41

Feng, Liqiang, et Hang Liu. « Unipolar pulse assisted generation of the coherent XUV pulses ». Optics Communications 348 (août 2015) : 1–6. http://dx.doi.org/10.1016/j.optcom.2015.03.026.

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42

Tsyplenkov V.V. et Shastin V.N. « Photon echo in germanium with shallow donors ». Semiconductors 56, no 8 (2022) : 513. http://dx.doi.org/10.21883/sc.2022.08.54454.22.

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A theoretical study was made of the conditions for observing the photon echo effect in a germanium crystal doped with shallow donors. A numerical calculation of the medium polarization excited by a sequence of two optical pulses at a frequency close to the impurity transition frequency has been made. The effect of excitation pulse parameters, such as the pulse duration, the inhomogeneous broadening of impurity transitions and the relaxation rate of population and coherence in the system on the echo is considered. The key aspect in the experimental implementation of the effect is the control of the crystal temperature under photoexcitation, since the rate of coherence relaxation in the system strongly depends on the temperature of the crystal lattice. Keywords: germanium, shallow donors, coherent effects, photon echo.
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43

Wang, Xingxing, Adam Patel et Alexey Shashurin. « Initial transient stage of pin-to-pin nanosecond repetitively pulsed discharges in air ». Journal of Applied Physics 132, no 1 (7 juillet 2022) : 013301. http://dx.doi.org/10.1063/5.0093794.

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In this work, evolution of parameters of nanosecond repetitively pulsed (NRP) discharges in pin-to-pin configuration in air was studied during the transient stage of initial 20 discharge pulses. Gas and plasma parameters in the discharge gap were measured using coherent microwave scattering, optical emission spectroscopy, and laser Rayleigh scattering for NRP discharges at repetition frequencies of 1, 10, and 100 kHz. Memory effects (when perturbations induced by the previous discharge pulse would not decay fully until the subsequent pulse) were detected for the repetition frequencies of 10 and 100 kHz. For 10 kHz NRP discharge, the discharge parameters experienced significant change after the first pulse and continued to substantially fluctuate between subsequent pulses due to rapid evolution of gas density and temperature during the 100 μs inter-pulse time caused by intense redistribution of the flow field in the gap on that time scale. For 100 kHz NRP discharge, the discharge pulse parameters reached a new steady-state at about five pulses after initiation. This new steady-state was associated with well-reproducible parameters between the discharge pulses and substantial reduction in breakdown voltage, discharge pulse energy, and electron number density in comparison to the first discharge pulse. For repetition frequencies 1–100 kHz considered in this work, the memory effects can be likely attributed to the reduction in gas number density and increase in the gas temperature that cannot fully recover to ambient conditions before subsequent discharge pulses.
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44

Garg, M., et K. Kern. « Attosecond coherent manipulation of electrons in tunneling microscopy ». Science 367, no 6476 (14 novembre 2019) : 411–15. http://dx.doi.org/10.1126/science.aaz1098.

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Nanoelectronic devices operating in the quantum regime require coherent manipulation and control over electrons at atomic length and time scales. We demonstrate coherent control over electrons in a tunnel junction of a scanning tunneling microscope by means of precise tuning of the carrier-envelope phase of two-cycle long (<6-femtosecond) optical pulses. We explore photon and field-driven tunneling, two different regimes of interaction of optical pulses with the tunnel junction, and demonstrate a transition from one regime to the other. Our results show that it is possible to induce, track, and control electronic current at atomic scales with subfemtosecond resolution, providing a route to develop petahertz coherent nanoelectronics and microscopy.
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45

CROOKER, S. A., et A. J. TAYLOR. « ULTRAFAST COHERENT TERAHERTZ SPECTROSCOPY IN HIGH MAGNETIC FIELDS ». International Journal of Modern Physics B 16, no 20n22 (30 août 2002) : 3385–88. http://dx.doi.org/10.1142/s0217979202014498.

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With an aim towards measuring the high-frequency complex conductivity of correlated electron materials in the regime of low temperatures and high magnetic fields, we introduce a method for performing time-domain terahertz spectroscopy directly in the cryogenic bore of existing dc and pulsed-field magnets. Miniature, fiber-coupled THz emitters and receivers are constructed and are demonstrated to work down to 5 K and up to 6 Tesla, for eventual use in higher-field magnets. Maintaining the sub-micron alignment between fiber and antenna during thermal cycling, and obtaining ultrafast (<200fs) optical gating pulses at the end of long optical fibers constitute the major technical challenges of this project. Preliminary data on YBCO superconducting thin films is shown.
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46

Wei, Yuxuan, Jiaming Le, Li Huang et Chuanshan Tian. « Efficient generation of intense broadband terahertz pulses from quartz ». Applied Physics Letters 122, no 8 (20 février 2023) : 081105. http://dx.doi.org/10.1063/5.0134139.

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Intense terahertz (THz) pulses facilitate the observation of various nonlinear optical effects and the manipulation of material properties. In this work, we report a convenient approach to produce strong broadband THz pulses with a center frequency tunable between 2 and 4 THz. A coherent THz light source with a pulse energy of 1.2 mJ can be generated from low-cost crystalline quartz using a tilted-pulse-front scheme. Thanks to the wide transparent spectral window and high damage threshold, our theoretical analysis and experiment show that the THz conversion efficiency in quartz reaches 0.05%, which is comparable with that in LiNbO3 at room temperature, while the output THz spectral range is much broader in the former. This work not only provides the light source that is urgently needed for nonlinear THz spectroscopy beyond 2 THz but also offers an alternative route in selecting nonlinear optical crystals for optical frequency conversion.
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47

BAEV, ALEXANDER, PONTUS WELINDER, ROBERT ERLANDSSON, JOHAN HENRIKSSON, PATRICK NORMAN et HANS ÅGREN. « A QUANTUM MECHANICAL — ELECTRODYNAMICAL APPROACH TO NONLINEAR PROPERTIES : APPLICATION TO OPTICAL POWER LIMITING WITH PLATINUM-ORGANIC COMPOUNDS ». Journal of Nonlinear Optical Physics & ; Materials 16, no 02 (juin 2007) : 157–69. http://dx.doi.org/10.1142/s0218863507003652.

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Light propagation in a medium is sensitively dependent on the shape and intensity of the optical pulse as well as on the electronic and vibrational structure of the basic molecular units. We review in this paper the results of systematic studies of this problem for isotropic media. Our theoretical approach—the quantum mechanical–electrodynamical (QMED) approach—is based on a quantum mechanical account of the many-level electron-nuclear medium coupled to a numerical solution of the density matrix and Maxwell's equations. This allows us to accommodate a variety of nonlinear effects which accomplish the propagation of strong light pulses. Particular attention is paid to the understanding of the role of coherent and sequential excitations of electron-nuclear degrees of freedom. The QMED combination of quantum chemistry with classical pulse propagation enables us to estimate the optical transmission from cross sections of multi-photon absorption processes and from considerations of propagation effects, saturation and pulse effects. Results of the theory suggest that in the nonlinear regime, it is often necessary to simultaneously account for coherent one-step and incoherent step-wise multi-photon absorption, as well as for off-resonant excitations even when resonance conditions prevail. The dynamic theory of nonlinear propagation of a few interacting intense light pulses is highlighted here in a study of the optical power limiting with platinum-organic molecular compounds.
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Ceraso, Arianna, Sen Mou, Andrea Rubano et Domenico Paparo. « Coherent THz Hyper-Raman : Spectroscopy and Application in THz Detection ». Materials 12, no 23 (23 novembre 2019) : 3870. http://dx.doi.org/10.3390/ma12233870.

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Recently we have demonstrated a new nonlinear optical effect in the THz interval of frequencies. The latter is based on the use of femtosecond optical pulses and intense, sub-ps, broadband terahertz (THz) pulses to generate a THz-optical four- and five-wave mixing in the investigated material. The spectrum of the generated signal is resolved in time and wavelength and displays two pronounced frequency sidebands, Stokes and anti-Stokes, close to the optical second harmonic central frequency 2 ω L , where ω L is the optical central frequency of the fundamental beam, thus resembling the spectrum of standard hyper-Raman scattering, and hence we named this effect ‘THz hyper-Raman’—THYR. We applied this technique to several crystalline materials, including α-quartz and gallium selenide. In the first material, we find that the THYR technique brings spectroscopic information on a large variety of low-energy excitations that include polaritons and phonons far from the Γ-point, which are difficult to study with standard optical techniques. In the second example, we show that this new tool offers some advantages in detecting ultra-broadband THz pulses. In this paper we review these two recent results, showing the potentialities of this new THz technique.
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49

Karni, O., A. K. Mishra, G. Eisenstein, V. Ivanov et J. P. Reithmaier. « Coherent control in room-temperature quantum dot semiconductor optical amplifiers using shaped pulses ». Optica 3, no 6 (26 mai 2016) : 570. http://dx.doi.org/10.1364/optica.3.000570.

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50

Itoh, Kohichi, Yasunori Toda, Ryuji Morita et Mikio Yamashita. « Coherent Optical Control of Molecular Motion Using Polarized Sequential Pulses ». Japanese Journal of Applied Physics 43, no 9A (9 septembre 2004) : 6448–51. http://dx.doi.org/10.1143/jjap.43.6448.

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