Готові списки джерел за темами / Ultra-Fast optic

Добірка наукової літератури з теми "Ultra-Fast optic"

Автор: Grafiati
Опубліковано: 8 червня 2024

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Зміст

  1. Статті в журналах
  2. Дисертації
  3. Книги
  4. Частини книг
  5. Тези доповідей конференцій

Статті в журналах з теми "Ultra-Fast optic":

1

Liu, Yi, Min Chen, Jinjian Li, Ming Chen, and Shiliang Qu. "An Ultra-Simple Microchannel-Free Fiber-Optic Gas-Pressure Sensor With Ultra-Fast Response." IEEE Sensors Journal 22, no. 7 (April 1, 2022): 6621–27. http://dx.doi.org/10.1109/jsen.2022.3151368.

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2

Wu, Nan, Xiaotian Zou, Ye Tian, John Fitek, Michael Maffeo, Christopher Niezrecki, Julie Chen, and Xingwei Wang. "An ultra-fast fiber optic pressure sensor for blast event measurements." Measurement Science and Technology 23, no. 5 (April 11, 2012): 055102. http://dx.doi.org/10.1088/0957-0233/23/5/055102.

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3

Wang, Yan, Tongtong Liu, Jiangyi Liu, Chuanbo Li, Zhuo Chen, and Shuhui Bo. "Organic electro-optic polymer materials and organic-based hybrid electro-optic modulators." Journal of Semiconductors 43, no. 10 (October 1, 2022): 101301. http://dx.doi.org/10.1088/1674-4926/43/10/101301.

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Abstract High performance electro-optic modulator, as the key device of integrated ultra-wideband optical systems, have become the focus of research. Meanwhile, the organic-based hybrid electro-optic modulators, which make full use of the advantages of organic electro-optic (OEO) materials (e.g. high electro-optic coefficient, fast response speed, high bandwidth, easy processing/integration and low cost) have attracted considerable attention. In this paper, we introduce a series of high-performance OEO materials that exhibit good properties in electro-optic activity and thermal stability. In addition, the recent progress of organic-based hybrid electro-optic devices is reviewed, including photonic crystal-organic hybrid (PCOH), silicon-organic hybrid (SOH) and plasmonic-organic hybrid (POH) modulators. A high-performance integrated optical platform based on OEO materials is a promising solution for growing high speeds and low power consumption in compact sizes.
4

Li, Jian Wei, Nan Xu, Jian Li, and Zhi Xin Zhang. "Ultrafast Electrical Signal Electro-Optic Sampling Test Theory and Test System." Advanced Materials Research 571 (September 2012): 471–75. http://dx.doi.org/10.4028/www.scientific.net/amr.571.471.

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Discussed the principle of electro-optic sampling technique and implementation methods of Ultra-fast electrical signals, the electric field of electro-optical crystal and sampling pulses as well as the interaction between the principle of time scanning unit, established the coplanar waveguide parameters model, and analyzed the technical indicators of test system.
5

Romashko, R. V., S. Di Girolamo, Y. N. Kulchin, J. C. Launay, and A. A. Kamshilin. "Fast-adaptive fiber-optic sensor for ultra-small vibration and deformation measurement." Journal of Physics: Conference Series 85 (October 1, 2007): 012024. http://dx.doi.org/10.1088/1742-6596/85/1/012024.

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6

Badr, Mohamed M., Mohamed Y. Abdelatty, and Mohamed A. Swillam. "Ultra-fast silicon electro-optic modulator based on ITO-integrated directional coupler." Physica Scripta 94, no. 6 (April 11, 2019): 065502. http://dx.doi.org/10.1088/1402-4896/ab0ce1.

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7

Shah, R. D., R. J. Cliffe, B. M. Novac, I. R. Smith, and P. Senior. "An ultra-fast electro-optic probe for 500 kV pulsed voltage measurements." Measurement Science and Technology 13, no. 2 (January 16, 2002): 226–28. http://dx.doi.org/10.1088/0957-0233/13/2/314.

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8

MacMahon, Rohan, and Murray Milner. "Ultra-fast broadband in New Zealand: Progress Accelerating." Australian Journal of Telecommunications and the Digital Economy 3, no. 4 (December 29, 2015): 12. http://dx.doi.org/10.18080/ajtde.v3n4.32.

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The New Zealand Government’s Ultrafast Broadband (UFB) initiative is now more than halfway completed. Pleasingly, deployment of Fibre To The Premises (FTTP) has tracked ahead of schedule over the last two years. As at September 2015, deployment was 56% complete, with over 800,000 households and businesses able to connect, equating to around 44% of the NZ population able to connect to an optic fibre broadband service. Communal deployment has been completed in 11 of the 35 eligible towns and cities, meaning fibre has been laid on public lands, enabling every household to order a UFB connection. A further eight towns/ cities are expected to be completed by June 2016. Uptake of UFB services is accelerating as Retail Service Providers (RSPs) increasingly see UFB as the right choice for themselves and their customers. Presently around 10,000 households and businesses connect every month. With over 130,000 connections in place as at September 2015, uptake is around one in 6, indicating that there is still a long way to go for New Zealanders to connect to improved broadband. Importantly, deployment to “priority” premises (businesses, schools and health facilities) is close to completion, and many of these customers report that UFB usage has helped them improve business productivity or service delivery. The goal for the UFB initiative is recognised as being delivered well by the New Zealand Government, to the point that at the 2014 election it committed to provide additional funding to increase the FTTP rollout from 75% population coverage to 80%.
9

MacMahon, Rohan, and Murray Milner. "Ultra-fast broadband in New Zealand: Progress Accelerating." Journal of Telecommunications and the Digital Economy 3, no. 4 (December 29, 2015): 12–25. http://dx.doi.org/10.18080/jtde.v3n4.32.

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The New Zealand Government’s Ultrafast Broadband (UFB) initiative is now more than halfway completed. Pleasingly, deployment of Fibre To The Premises (FTTP) has tracked ahead of schedule over the last two years. As at September 2015, deployment was 56% complete, with over 800,000 households and businesses able to connect, equating to around 44% of the NZ population able to connect to an optic fibre broadband service. Communal deployment has been completed in 11 of the 35 eligible towns and cities, meaning fibre has been laid on public lands, enabling every household to order a UFB connection. A further eight towns/ cities are expected to be completed by June 2016. Uptake of UFB services is accelerating as Retail Service Providers (RSPs) increasingly see UFB as the right choice for themselves and their customers. Presently around 10,000 households and businesses connect every month. With over 130,000 connections in place as at September 2015, uptake is around one in 6, indicating that there is still a long way to go for New Zealanders to connect to improved broadband. Importantly, deployment to “priority” premises (businesses, schools and health facilities) is close to completion, and many of these customers report that UFB usage has helped them improve business productivity or service delivery. The goal for the UFB initiative is recognised as being delivered well by the New Zealand Government, to the point that at the 2014 election it committed to provide additional funding to increase the FTTP rollout from 75% population coverage to 80%.
10

Belhassen, Jérémy, Zeev Zalevsky, and Avi Karsenty. "Optical Polarization Sensitive Ultra-Fast Switching and Photo-Electrical Device." Nanomaterials 9, no. 12 (December 7, 2019): 1743. http://dx.doi.org/10.3390/nano9121743.

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Ultra-fast electrical switches activated with an optical-polarized light trigger, also called photo-polarized activated electrical switches, are presented. A set of new transistor circuits is switched by light from above, illuminating deep V-grooves, whose angle is sensitive to the polarization of the incident. Thus, this application may serve for encryption/decryption devices since the strongest electrical responsivity is only obtained for very specific spatial polarization directions of the illumination beam. When this V-groove is sufficiently narrow, the device mainly responds to one polarization and not to the other. In such a way, electrons are generated only for one specific polarization. While the nature of the data remains electronic, the modulation control is optic, creating a photo-induced current depending on the polarization direction. This coupled device acts as a polarization modulator as well as an intensity modulator. The article focuses on the integration of several devices in different configurations of circuitry: dual, triple, and multi-element. Case studies of several adjacent devices are presented with varying critical variables, such as the V-groove aperture dimensions. Analytical models and complementary numerical analyses are presented for the future smooth integration into Complementary Metal-Oxide-Semiconductor (CMOS) technology.
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Статті в журналах Дисертації

Дисертації з теми "Ultra-Fast optic":

1

Fan, Xiaofei. "Contrôle ultrarapide de l'aimantation dans des hétérostructures à base de VO₂." Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0271.

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(1) Nous aVO₂vons étudié la transition de phase dans le VO₂ amorphe ultrafin et son mécanisme physique : Nous avons préparé avec succès des films amorphes ultraminces (à l'échelle nanométrique) de VO₂ avec une transition de phase significative par pulvérisation magnétron et démontré la transition de phase du VO₂ amorphe - EGT. En outre, nous avons modélisé quantitativement la transition de phase du VO₂ amorphe et classé différentes épaisseurs de VO₂ en "système fort" (>5 nm) et "système fragile" (0-2 nm). Pour le système fort, les propriétés du matériau sont moins affectées par la température, et le modèle d'Arrhenius est utilisé pour décrire le transport d'électrons de la transition de phase du VO₂. Alors que pour le système fragile, les propriétés du matériau sont plus affectées par les fluctuations de température, et le modèle de Vogel-Tammann-Fulcher peut être utilisé pour l'analyse. Les résultats démontrent le mécanisme de transition de phase des matériaux amorphes et fournissent une nouvelle idée pour comprendre la transition de phase. En outre, cette méthode directe de croissance de VO₂ ultra-mince par pulvérisation magnétron est pratique et rapide, et il peut être cultivé dans le même lot avec d'autres matériaux dans l'hétérostructure, ce qui devrait promouvoir l'application de matériaux à transition de phase dans des dispositifs pratiques. (2) Nous avons exploré une méthode permettant de réguler dynamiquement le couplage d'échange entre couches par transition de phase : nous avons introduit le VO₂ dans la couche ferromagnétique/non magnétique et nous avons réussi à réaliser la transformation réversible du couplage antiferromagnétique et du couplage ferromagnétique en régulant les électrons de conduction par le MIT de VO₂. En même temps, à partir de l'analyse du changement des propriétés magnétiques, nous clarifions que le CEI induit par le VO₂ dans différents états électroniques est dominé par le RKKY et l'effet tunnel dépendant du spin. En outre, nous étudions en détail la racine physique derrière la régulation de l'IEC par le VO₂, et nous révélons le mécanisme de régulation de l'effet de spin de l'interface par la régulation des états électroniques de l'espaceur non magnétique. Cette partie du travail propose une nouvelle approche de la régulation dynamique de l'IEC, qui fournit de nouvelles idées pour l'application de l'IEC dans les dispositifs spintroniques. (3) Nous étudions la régulation dynamique du transport d'électrons chauds polarisés en spin par transition de phase : Dans une hétérostructure ferrimagnétique/non magnétique à canal de diffusion/ferromagnétique, nous introduisons du VO₂ dans le canal de diffusion pour contrôler les propriétés électriques du canal par MIT, puis nous régulons dynamiquement le transport des électrons chauds polarisés en spin générés par la désaimantation ultrarapide de GdCo. En régulant l'activation et la désactivation des électrons chauds dans le canal, nous obtenons une régulation dynamique de l'aimantation des couches ferromagnétiques adjacentes. Parallèlement, grâce aux changements de propriétés optiques introduits par le VO₂, nous avons réussi à commuter l'aimantation de matériaux ferromagnétiques sans AOS en ferrimagnétisme excité par un laser femtoseconde à impulsion unique. De plus, nous avons vérifié et analysé le mécanisme de cette modulation ultrarapide. Dans ce travail, nous utilisons le matériau de transition de phase VO₂ comme canal de diffusion avec des propriétés électriques contrôlables pour contrôler le transport des électrons chauds à travers le MIT. Les résultats montrent que les matériaux non magnétiques jouent un rôle important dans différents types d'hétérostructures
(1) We have investigated the phase transition in ultrathin amorphous VO₂ and its physical mechanism: We have successfully prepared ultrathin (nano-scale) amorphous VO₂ films with significant phase transition by magnetron sputtering and demonstrated the phase transition of amorphous VO₂ - EGT. In addition, we quantitatively modeled the phase transition of amorphous VO₂ and classified different thicknesses of VO₂ into "strong system" (>5 nm) and "fragile system" (0-2 nm). For the strong system, the material properties are less affected by temperature, and the Arrhenius model is used to describe the electron transport of VO₂ phase transition. While for the fragile system, the material properties are more affected by temperature fluctuations, and the Vogel-Tammann-Fulcher model can be used for analysis. The results demonstrate the phase transition mechanism of amorphous materials and provide a new idea for understanding phase transition. In addition, this direct method of growing ultrathin VO₂ using magnetron sputtering is convenient and fast, and it can be grown in the same batch with other materials within the heterostructure, which is expected to promote the application of phase transition materials in practical devices.(2) We explored a method to dynamically regulate the interlayer exchange coupling by phase transition: we introduced the VO₂ into the ferromagnetic/nonmagneticspacer/ferromagnetic heterostructure, and successfully realized the reversible transformation of the antiferromagnetic coupling and ferromagnetic coupling through regulating conduction electrons by MIT of VO₂. At the same time, from the analysis of the change of magnetic properties, we clarify that the IEC induced by VO₂ in different electronic states is dominated by the RKKY and spin dependent tunneling. Furthermore, we fully investigate the physical root behind the regulation of IEC by the VO₂, and reveal the regulation mechanism of the interface spin effect by the regulation of electronic states of non-magnetic spacer. This part of the work proposes a novel approach to the dynamic regulation of IEC, which provides new ideas for the application of IEC in spintronic devices.(3) We study the dynamic regulation of spin-polarized hot electron transport by phase transition: In a ferrimagnetic/nonmagnetic diffusion channel/ferromagnetic heterostructure, we introduce VO₂ into the diffusion channel to control the electrical properties of the channel by MIT, and then dynamically regulate the transport of spin-polarized hot electrons generated by the ultrafast demagnetization of GdCo. By regulating the on/off of hot electrons in the channel, we achieve dynamic regulation of the magnetization of adjacent ferromagnetic layers. Meanwhile, with the optical property changes introduced by VO₂, we have successfully achieved the switching of the magnetization of ferromagnetic materials without AOS in ferrimagnetism excited by a single-pulse femtosecond laser. Furthermore, we have verified and analyzed the mechanism of this ultrafast modulation. In this work, we use the phase transition material VO₂ as a diffusion channel with controllable electrical properties to control the hot electron transport through MIT. The results show that the non-magnetic materials play an important role in various types of heterostructures
2

Koseoglu, Devrim. "Material Characterization With Terahertz Time-domain Spectroscopy." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/2/12611648/index.pdf.

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Terahertz time-domain spectroscopy systems were developed and used for the anaylsis and characterization of various materials. By using ultra-fast Ti:Sapphire and Er-doped fiber lasers, terahertz time-domain spectrometers of different configurations were constructed and tested. To increase the accuracy and sensitivity of the measurements, the systems were optimized for spectroscopic analysis. MBE grown nominally undoped epitaxial GaAs samples were used for the spectroscopic measurements. These samples were first charactrized by electrical measurements in order to check the accuracy of the terahertz time-domain experiments. We have shown that the terahertz time-domin spectroscopic techniques provides a quick way of the determining the real ( ) and complex () components of the refractive index of material. In addition, we have investigated the photoexcitation dynamics of these GaAs samples. We have demonstrated that direct and photoexcited terahertz time-domain measurements give an estimate of the carrier densities and both the hole and electron mobility values with good precision. rnin An algorithm is developed to prevent the unwanted Fabry-Perot reflections which is commonly encountered in Terahertz Spectroscopy systems. We have performed terahertz time-domain transmission measurements on ZnTe <
110>
crystals of various thicknesses to test the applicability of this algorithm. We have shown that the algorithm developed provides a quick way of eliminating the &ldquo
etalon&rdquo
reflections from the data. In addition, it is also shown that these &ldquo
etalon&rdquo
effects can be used for the frequency calibration of terahertz time-domain spectrometers.
3

Bahamin, Babak. "Fabrication and packaging of a 1X4 ultra fast all-photonic switch." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=83850.

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This document presents the design, fabrication, characterization and packaging of a stand-alone all-photonic 1X4 switch. All of the designs pertaining to the implementation of the device including those of required custom components are given. The core of the switch is comprised of a "2-bit" electro-optic deflector capable of sub-microsecond deflection times. The packaged switch operates at 1100V and boasts a worst-case fiber-to-fiber insertion loss and crosstalk reading of 5.3dB and -23dB, respectively. Furthermore, a worst-case deflection time of 86ns has been achieved.
4

Ramos-Ortiz, Gabriel. "Frequency conversion in conjugated organic molecules and its applications to ultra-fast pulse diagnostic and imaging." Diss., The University of Arizona, 2003. http://hdl.handle.net/10150/289952.

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This dissertation is devoted to the study of third-harmonic generation (THG) in push-pull chromophore-doped polymer films. This kind of films, with amorphous structure, exhibit null second harmonic generation but strong THG when pumped at the fundamental wavelengths within the telecommunication range (1.4-1.6 μm). It is demonstrated that at 1550 nm, micrometer-thick samples generate up to 17 muW of green light with an input power of 250 mW delivered by an optical parametric oscillator. This high conversion efficiency is achieved without the use of phase matching or cascading of quadratic nonlinear effects and it is due to high values of the third-order nonlinear susceptibility combined with weak film absorption at the third harmonic wavelength. The efficient THG process opens the doors to low cost and sensitive third-order optical autocorrelation and cross-correlation applications. So, in addition to the basic research performed about the characterization of the THG in push-pull chromophore-doped polymer films, two applications are demonstrated. The first is the complete diagnostic of femtosecond pulses by THG-Interferometric Autocorrelation and by THG Frequency-Resolved Optical Gating. The second is the THG-Cross-correlation Time-Gated Imaging of objects embedded in highly scattering conditions.
5

Eibna, Halim Md Zubaer. "Passively mode-locked picosecond Nd:KGW laser with low quantum defect diode pumping." Astro Ltd, 2016. http://hdl.handle.net/1993/31913.

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Solid-state lasers are capable of providing versatile output characteristics with greater flexibility compared to other popular laser systems. Lasing action has been achieved in many hundreds of solid-state media, but Nd-ion doped gain media are widely used to reach high power levels with short pulses. In this work, commercially available Nd:KGW crystal served as a gain medium to achieve pulsed operation at 1067 nm. This laser crystal offers large stimulated emission crosssection and gain bandwidth which facilitates generation of high peak power pulses in the picosecond regime. The KGW crystal is monoclinic and biaxial in structure, and anisotropic in its optical and thermal properties. Due to poor thermal conductivity, this crystal can be operated within a limited power range before crystal fracture takes place. To reduce the amount of heat deposited in the gain media, we introduced a new pumping wavelength of 910 nm which reduces the quantum defect by more than 45%. Continuous-wave laser operation was optimized to operate in mode-locked regime. In order to achieve short light pulses from the continuous-wave laser, one of the end mirrors was replaced by a semiconductor saturable absorber mirror (SESAM) to generate 2.4 ps pulses at a repetition rate of 83.8 MHz. An average output power of 87 mW was obtained at lasing wavelength of 1067 nm and the beam was nearly diffraction limited with M^2 < 1.18. The peak power of the generated pulses was 427 W and energy of each pulse was >1 nJ. Pumping the crystal at longer wavelength (910 nm) reduced the thermal lensing of the crystal by half when compared to conventional pumping at shorter wavelength (808 nm). To the best of our knowledge, this is the first time passive mode-locking of a Nd:KGW laser was explored using the pump wavelength at 910 nm.
February 2017
6

Dong, Peiliang. "On-chip ultra-fast data acquisition system for optical scanning acoustic microscopy using 0.35um CMOS technology." Thesis, University of Nottingham, 2009. http://eprints.nottingham.ac.uk/10667/.

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Optical Scanning Acoustic Microscopy (OSAM) is a non-contacting method of investigating the properties and hidden faults of solid materials. This thesis presents an ultra-fast data acquisition system (DAQ) which samples and digitises the output signal of OSAM. The author's work includes the design of the clock source and the sampler, and integration of the whole system. The clock source is a unique pulse generator based on a 2.624GHz PLL with a Quadrature VCO (QVCO), which is able to generate 4 clock signals in accurate quadrature phase difference. The pulse generator used the 4-phase clocks to provide control pulses to the sampler. The pulses were carefully aligned to the clock edges by digital logic, so that jitters were reduced as much as possible. The required short time delay for the sampler was also provided by the pulse generator, and this was implemented by a smartly-controlled switch box which re-shuffles the 4-phase clocks. The presented sampler is a novel 10.496GSample/s Sub-Sampling Sample-and-Hold Amplifier (SHA). The SHA sampled the input, and transformed its spectrum down to a low-frequency range so that it can be digitised. Charge-domain sampling strategy and double differential switches were both developed in this circuit to significantly improve the sampling speed. The periodicity of the system input was exploited in repetitive sampling to reduce the noise. These designed modules were integrated into a DAQ for a 2x8 sensor array. A pseudo-parallel scanning strategy was presented to minimise the power consumption, and a current-based buffer was applied to deliver the control pulses into the array. The DAQ was implemented on-chip in a low-cost 0.35um standard CMOS process. The measurement results showed that the DAQ successfully achieved a sampling rate more than 10GS/s, with a maximum output resolution of approximately 6 bits.
7

Pariente, Gustave. "Caractérisation spatio-temporelle d’impulsions laser de haute puissance." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS003/document.

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Les lasers de haute puissance permettent d'atteindre des intensités très importantes (jusqu'à 10²²W.cm⁻²). Parvenir à ce niveau d'intensité nécessite de concentrer une quantité modérée d'énergie (de l'ordre du joule) dans un temps très court (de l'ordre de la dizaine de femtosecondes) sur une surface réduite (de l'ordre du μm²). Ces faisceaux sont donc ultra-courts et focalisés à l'aide d'une optique à grande ouverture. Ces caractéristiques signifient que leur diamètre avant focalisation est grand et leur largeur spectrale est importante. Pour cette raison, ces faisceaux sont à même de présenter des distorsions spatio-spectrales (ou couplages spatio-temporels). Après focalisation, ces distorsions ont pour effet une diminution drastique de l'intensité pic. Ceci est d'autant plus vrai que le système laser est puissant et donc que son diamètre et sa largeur spectrale sont grands. En dépit de cet effet néfaste, les couplages spatio-temporels présentent aussi un intérêt lorsqu'ils sont maitrisés. On peut en effet introduire des couplages spatio-temporels de faible amplitude à des fins expérimentales. Dans les années 1990 et 2000, un effort important a été fourni pour permettre la caractérisation et l'optimisation du profil temporel des lasers femtoseconde. Dans le même temps, des solutions d'optique adaptative ont été développées pour contrôler le profil spatial des faisceaux ultra-intenses et obtenir la meilleure tache focale possible. Les systèmes laser de haute-puissance actuels sont maintenant caractérisés et optimisés indépendamment par ces deux types de diagnostics. Par essence, cette approche est aveugle aux couplages spatio-temporels. Seule une caractérisation spatio-temporelle permettrait de mesurer ces distorsions. Il existait déjà des méthodes de caractérisation spatio-temporelle avant le début de cette thèse. Aucun de ces dispositifs n'avait cependant été adapté à la mesure de faisceaux ultra-intenses. Lors de cette thèse, nous avons développé une nouvelle technique de caractérisation spatio-temporelle appelée TERMITES. Cette technique est basée sur un schéma de spectroscopie par transformée de Fourier auto-référencée. TERMITES nous a permis d'effectuer la première caractérisation spatio-temporelle totale d'un laser 100 TW (le laser UHI-100 du CEA Saclay). Les distorsions spatio-temporelles détectées à l'aide de ces mesures ont confirmé la nécessité d'une généralisation de la métrologie spatio-temporelle des lasers de haute puissance
High power laser make it possible to reach very high intensities (up to 10²²W.cm⁻²). In order to get to this level of intensity, a moderate quantity of energy (on the order of the Joule) is concentrated in a very short time (on the order of tens of femtoseconds) onto a small surface (on the order of 1 μm²). These beams are therefore ultra-short and focused with a high aperture optic. These features mean that their diameter prior to focus is large and their spectral width is big. As a result, these beams are subject to spatio-spectral distorsions (of spatio-temporal couplings). After focus, these distorsions induce a dramatic reduction of the peak intensity. This situation is all the more true when the laser is more intense and its diameter and spectral width are therefore bigger. Despite their detrimental effects, spatio-temporal couplings can be of great interest when controlled. One can indeed introduce weak spatio-temporal couplings for experimental purposes. In the 1990s and 2000s, a big effort was put in order to characterize dans optimize the temporal profile of femtosecond lasers. Meanwhile, adaptative optics solutions were developed to control the spatial profil of ultra intense laser beams and provide the best focal spot achievable. By nature, this approach is blind to spatio-temporal couplings. Measuring these distorsions requires a spatio-temporal characterization. Before the start of this Phd thesis, spatio-temporal characterization methods already existed. Although none of these devices were ever adapted to the measurement of ultra-intense laser beams. During this Phd Thesis, we developped a new spatio-temporal characterization technique which we called TERMITES. This technique is based on a self-referenced Fourier transform spectroscopy scheme. TERMITES made it possible for us to perform the first total spatio-temporal characterization of a 100 TW laser (UHI-100 at CEA Saclay, France). The detection of spatio-temporal distorsions with the help of these measurements confirmed the need for a generalization of spatio-temporal characterization of ultra-high power lasers
8

Andreoli, Daria. "Contrôle spatio-temporel multi-spectral de la lumière en milieux complexes." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066679/document.

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La matrice de transmission permet de décrire les effets produit par un milieu multi-diffusant sur une onde monochromatique incidente. L'objectif des travaux présentés dans cette thèse est de développer le concept de matrice de transmission d'un milieu multi-diffusant au cas plus général d'une onde polychromatique impulsionnelle ultra-brève. Dans ce manuscrit nous présentons et mesurons la matrice de transmission multi-spectrale d'un milieu complexe. Cette nouvelle matrice nous donne l'information fondamentale sur le couplage spatio-temporel et spatio-spectral que le milieu engendre au passage d'une onde ultra-brève. Elle permet aussi de contrôler une source monochromatique et polychromatique, après avoir traversé un milieu complexe, de manière déterministe. Nous exploitons ainsi cette connaissance du milieu pour compenser les distorsions du champs en focalisant, façonnant et contrôlant spatialement, spectralement et temporellement un laser ultra-bref grâce à la seule mesure d'une matrice de transmission multi-spectrale. Cette méthode ouvre les portes de plusieurs applications d'imagerie à travers des milieux complexes, ainsi que pour l'interaction lumière-matière en milieux diffusants
The transmission matrix allows to describe the effects generated by a multiple scattering medium on an incident monochromatic wave. The aim of the work presented in this dissertation is to develop the concept of transmission matrix of a multiple scattering medium to the more general case of a polychromatic ultra-fast pulsed light. In this dissertation we present and measure the multi-spectral transmission matrix of a complex medium. This new matrix describes the spatio-temporal coupling and the spatio-spectral coupling induced by the medium on a polycrhomatic illumination passing through it. The measurement of the multi-spectral transmission matrix allows us to control a monochromatic as well as a polychromatic source, after being scattered by the medium, in a deterministic way. We exploit this knowledge about the medium to compensate the distortions of the optical field by focusing, shaping and controlling spatially, spectrally and temporally an ultra-fast laser, thanks to the knowledge of the multi-spectral transmission matrix. This method paves the way towards many applications in the domain of imaging and light-matter interaction of light through complex media
9

McKee, Erik. "Femtosecond Filament Interaction as a Probe for Molecular Alignment." Master's thesis, University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5991.

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Femtosecond laser filamentation is a highly nonlinear propagation mode. When a laser pulse propagates with a peak power exceeding a critical value Pcr (5 GW at 800 nm in air), the Kerr effect tends to collapse the beam until the intensity is high enough to ionize the medium, giving rise to plasma defocusing. A dynamic competition between these two effects takes place leaving a thin and weakly ionized plasma channel in the trail of the pulse. When an ultrafast laser pulse interacts with molecules, it will align them, spinning them about their axis of polarization. As the quantum rotational wave packet relaxes, the molecules will experience periodic field-free alignment. Recent work has demonstrated the effect of molecular alignment on laser filamentation of ultra-short pulses. Revival of the molecular alignment can modify filamentation parameters as it can locally modify the refractive index and the ionization rate. In this thesis, we demonstrate with simulations and experiments that these changes in the filament parameters (collapse distance and filament plasma length) can be used to probe molecular alignment in CO2.
M.S.
Masters
Optics and Photonics
Optics and Photonics
Optics
10

Lopes, Guido Nunes. "Medidas de tempos de relaxação ultra-curtos em DODCI com a técnica de eco de fótons com luz incoerente." Universidade de São Paulo, 1989. http://www.teses.usp.br/teses/disponiveis/54/54131/tde-14102014-100721/.

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A técnica de eco de fótons com luz temporalmente incoerente (EFLI) foi utilizada neste trabalho para a medida do tempo de relaxação transversal T2 do Iodeto de 3-3´-Dietiloxadicarbonocianina (DODCI) como função da temperatura. Nestes experimentos foi utilizado um laser de corante de banda larga, bombeado pelo 2° harmônico de um laser de Nd+3 : YAG Q-switched. Este laser operou com os corantes Kiton Red 620 e rodamina 640, cujos máximos do espectro de emissão estão respectivamente em 598 e 610 nm. O tempo de relaxação T2, que é proporcional ao inverso da largura de linha homogênea, segue uma dependência funcional com a temperatura do tipo T-1,9. Encontramos o valor de T2 entre 0 e 30fs para λ = 598nm e entre 30 e 590fs para λ = 610nm, no intervalo de temperatura entre 300 e 60k. Os perfis das medidas de EFLI podem ser descritos por um modelo baseado num sistema quântico de dois níveis
The photon echo with incoherent light technique (EFLI) has been used in this work for the measurement of the transverse relaxation time T2 in 3-3´-Dietiloxadicarboncyanine Iodide (DODCI) as a function of the temperature. A broad-band dye laser, pumped by the second harmonic of a Q-switched Nd+3 : YAG laser, was used in this experiment. The laser used Kiton Red 620 and rodamine 640 dyes, whose maxima output power are respectively around 598 and 610nm. The relaxation time T2 , which is inversely proportional to the homogeneous linewidth, depends on the temperature according to a T-1,9 Law. We found the value of T2 ranging from 0 to 30fs at 598nm and from 30 to 590fs at 610nm in the temperature range between 300 and 60K. The EFLI profiles can be described by means of a two-level quantum system model
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Книги з теми "Ultra-Fast optic":

1

Binh, Le Nguyen. Ultra-fast fiber lasers: Principles and applications with MATLAB models. Boca Raton: CRC Press, 2010.

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2

Binh, Le Nguyen, and Nam Quoc Ngo. Ultra-Fast Fiber Lasers. Taylor & Francis Group, 2010.

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3

Ishikawa, Hiroshi. Ultra-Fast All-Optical Signal Processing Devices. Wiley & Sons, Limited, John, 2008.

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4

Binh, Le Nguyen, and Nam Quoc Ngo. Ultra-Fast Fiber Lasers: Principles and Applications with MATLAB® Models. Taylor & Francis Group, 2018.

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5

Binh, Le Nguyen, and Nam Quoc Ngo. Ultra-Fast Fiber Lasers: Principles and Applications with MATLAB® Models. Taylor & Francis Group, 2018.

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6

Binh, Le Nguyen, and Nam Quoc Ngo. Ultra-Fast Fiber Lasers: Principles and Applications with MATLAB® Models. Taylor & Francis Group, 2018.

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7

Binh, Le Nguyen, and Nam Quoc Ngo. Ultra-Fast Fiber Lasers: Principles and Applications with MATLAB® Models. Taylor & Francis Group, 2018.

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8

Binh, Le Nguyen, and Nam Quoc Ngo. Ultra-Fast Fiber Lasers: Principles and Applications with MATLAB® Models. Taylor & Francis Group, 2018.

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Частини книг з теми "Ultra-Fast optic":

1

Glesk, Ivan, Bing C. Wang, Lei Xu, Varghese Baby, and Paul R. Prucnal. "Ultra-fast all-optical switching in optical networks." In Progress in Optics, 53–117. Elsevier, 2003. http://dx.doi.org/10.1016/s0079-6638(03)80004-5.

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Тези доповідей конференцій з теми "Ultra-Fast optic":

1

Manipatruni, Sasikanth, Carl Poitras, Qianfan Xu, and Michal Lipson. "Ultra fast electro-optic tuning of optical quality factor." In 2008 Conference on Lasers and Electro-Optics (CLEO). IEEE, 2008. http://dx.doi.org/10.1109/cleo.2008.4551683.

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2

Ricart, Glenn. "Next Generation Applications and Services for Ultra-fast Broadband." In National Fiber Optic Engineers Conference. Washington, D.C.: OSA, 2013. http://dx.doi.org/10.1364/nfoec.2013.ntu3j.6.

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3

Larger, Laurent, Vladimir S. Udaltsov, Stephane Poinsot, Pierre-Ambroise Lacourt, Jean-Marc Merolla, and Marc Hanna. "Electro-optic nonlinear oscillator for ultra-fast secure chaos communication." In European Symposium on Optics and Photonics for Defence and Security, edited by Keith L. Lewis. SPIE, 2004. http://dx.doi.org/10.1117/12.578422.

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4

Semenov, D. V., E. Nippolainen, and A. A. Kamshilin. "Scanning ultra fast distance sensor based on acousto-optic deflection." In 2006 Northern Optics. IEEE, 2006. http://dx.doi.org/10.1109/no.2006.348366.

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5

Fuhua, Liu, An Yuying, Wang Ping, Shao Bibo, and Feng Guobin. "Development of 3GHz Analog Fiber Optic Link for Ultra-fast Signal Transmission." In 2012 International Conference on Industrial Control and Electronics Engineering (ICICEE). IEEE, 2012. http://dx.doi.org/10.1109/icicee.2012.384.

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6

Sugimoto, R., H. Miyauchi, K. Shima, K. Himeno, H. Hosoya, Y. Horiuchi, Y. Tanaka, Y. Oikawa, N. Shiga, and H. Nagaeda. "Transient Performance of Ultra-Fast AGC-EDFA in 40-channel Add/Drop Operation." In National Fiber Optic Engineers Conference. Washington, D.C.: OSA, 2009. http://dx.doi.org/10.1364/nfoec.2009.jwa16.

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7

Gan, Zelin, Mykyta Shevchenko, Sam Nallaperuma Herzberg, and Seb J. Savory. "Fast and Accurate DNN-Based Approach in Maximizing Ultra-Wideband Fiber-Optic Systems Throughput." In Optical Fiber Communication Conference. Washington, D.C.: Optica Publishing Group, 2024. http://dx.doi.org/10.1364/ofc.2024.m4k.6.

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We present a fast and accurate physical layer model assisted by a neural network to maximize the throughput for ultra-wideband systems. The proposed approach significantly saves computation time and keeps the same precision.
8

Wang, Juan, Yu Jin, Chen Zhu, Feng Gao, Yongxin Cui, Gang Cheng, and Xu Zhou. "An Open Line System with Ultra-fast Protection Switching for Data Center Interconnect." In Optical Fiber Communication Conference. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/ofc.2023.m1g.5.

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We present a DCI OLS with 5ms ultra-fast protection switching. By optimizing the DSP traffic rebuild time with a magneto-optic switch, we are able to improve the current ITU standard by an order of magnitude.
9

Yi, Xingwen, Zhaohui Li, Yuan Bao, and Kun Qiu. "Ultra-fast, High-resolution, and Linear Characterization of Passive Optical Components via Optical Channel Estimation." In National Fiber Optic Engineers Conference. Washington, D.C.: OSA, 2012. http://dx.doi.org/10.1364/nfoec.2012.jth2a.9.

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10

Akemann, Walther, Cathie Ventalon, Jean-François Léger, Benjamin Mathieu, Stéphane Dieudonné, Baptiste Blochet, Sylvain Gigan, and Laurent Bourdieu. "Ultra-fast 3D scanning and holographic illumination in non-linear microscopy using acousto-optic deflectors." In SPIE Technologies and Applications of Structured Light, edited by Toyohiko Yatagai, Yoshihisa Aizu, Osamu Matoba, and Yasuhiro Awatsuji. SPIE, 2017. http://dx.doi.org/10.1117/12.2275143.

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