Abstract:
PROBLEM TO BE SOLVED: To provide a device for dispersing light pulses in which relative amplitudes of pulses at various wavelengths can be modified over time. SOLUTION: The device for dispersion of light pulses of an optical beam (Fi) is composed of two dispersive prisms (P 1 , P 2 ), with the same vertex angle (α), mounted head to tail, the optical input surface of the first prism (P 1 ) being parallel to the optical output surface of the second prism (P 2 ), and the distance (L) separating the optical input surface of the first prism (P 1 ) from the optical output surface of the second prism (P 2 ) being adjustable, wherein the material constituting at least one of the first and second prisms (P 1 , P 2 ) is an acousto-optic material allowing for acousto-optic interaction between the optical beam and an acoustic beam, and the acoustic wave of the acoustic beam generates an integrated deflective Bragg cell in at least one of the first and second prisms (P 1 , P 2 ). COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method for high-resolution acousto-optic programmable filtering in an infrared region of incident optical wave. SOLUTION: A birefringent acousto-optic crystal(TR) is used, wherein the propagation speed of acoustic waves is slow, such as compounds of mercury. The acousto-optic crystal comprises, on one of its faces, a piezoelectric transducer designed to generate a transverse acoustic wave with wave vector(K) whereof the energy propagates according to the same axis(▵) but in the opposite direction to the energy of the incident optical wave(O i ), knowing that the optical wave(O d ) resulting from the acousto-optic interaction between the incident optical wave and the acoustic wave with wave vector(K) is diffracted perpendicularly or almost perpendicularly to the direction of the incident optical wave(O i ). COPYRIGHT: (C)2009,JPO&INPIT
Abstract translation:要解决的问题:提供在入射光波的红外区域中的高分辨率声光可编程滤波的方法。 解决方案:使用双折射声光晶体(TR),其中声波的传播速度较慢,例如汞化合物。 声光晶体在其一个面上包括设计成产生具有波矢(K)的横向声波的压电传感器,其能量根据相同的轴线(▵)传播,但是与 知道入射光波与具有波的声波之间的声光相互作用产生的光波(O i SB>)的入射光波(O i SB>) 矢量(K)垂直于或几乎垂直于入射光波的方向(O i SB>)衍射。 版权所有(C)2009,JPO&INPIT
Abstract:
Generator of short optical pulses includes: a generator of optical pulses with a wavelength equal to λ/2 and a spectral width less than λ/3; a generator of optical pulses of a duration less than 10 picoseconds at a wavelength λ/3; a device for recombining the pulses from the generators; a parametric amplification device receiving the output of the recombination device as input; a filter extracting, from the output of the amplification device, a band centred about a wavelength λ; a second harmonic generator receiving the output of the filter and generating a band centred over a wavelength λ/2; a programmable device making it possible to temporally adjust the pulses corresponding to the bands, in order to allow for the generation of a pulse with a wavelength equal to λ/3 and of a duration less than the period of the optical cycle.
Abstract:
L'invention concerne un dispositif acousto-optique programmable dans lequel une onde optique d'entrée de polarisation inconnue interagit successivement avec plusieurs faisceaux acoustiques distincts générés, dans un ou plusieurs milieux élasto-optiques biréfringents, au moyen de transducteurs piézo-électriques (T 1 à T 6 ). Ce dispositif comporte des circuits de génération de fréquences discrètes d'amplitudes programmables appliquées aux transducteurs (T 1 à T 6 ), et fournissant une onde optique de sortie portant une modulation en amplitude de son spectre de fréquence qui est une fonction à la fois de la modulation de l'onde optique d'entrée et de la modulation des ondes acoustiques. L'invention s'applique notamment aux systèmes de communication optiques multiplexés en longueurs d'onde.
Abstract:
Dispositif de contrôle programmable de l'amplitude et de la phase spectrale d'impulsions lumineuses en sortie d'un mélangeur optique (M) effectuant l'interaction colinéaire de signaux optiques issus de deux voies (V 1 , V 2 ), comprenant : sur les susdites voies (V 1 , V 2 ), respectivement deux étireurs d'impulsions (S 1 , S 2 ) allongeant les impulsions lumineuses brèves générées respectivement par deux sources lasers (L 1 , L 2 ), sur au moins l'une des susdites voies (V 1 , V 2 ), un contrôleur programmable (P 1 , P 2 ) de contrôle de l'amplitude et de la phase des signaux issus des susdits étireurs d'impulsions (S 1 , S 2 ), et en sortie du susdit mélangeur optique (M) un compresseur (C) des impulsions issues dudit mélange optique (M).
Abstract:
A system for generating short optical pulses having a very high temporal contrast at a wavelength λ, includes: a generator of optical pulses B1 outputting pulses at a wavelength substantially equal to λ; a generator of optical pulses P, B2 outputting pulses at a wavelength substantially equal to 2*λ3; a device R for recombining the pulses from the generators; a parametric amplifier A receiving the output of the recombination device R as an input; a filter F2 extracting, from the output of the parametric amplification device A, a band centered about a wavelength equal to 2*λ; a second harmonic generator NL receiving the output of the filter F2, at the input; a filter F3 centered about a wavelength equal to λ, extracting the second harmonic wavelengths of the pulses produced by the second harmonic generator NL.
Abstract:
A system for generating short optical pulses having a very high temporal contrast at a wavelength λ, includes: a generator of optical pulses B1 outputting pulses at a wavelength substantially equal to λ; a generator of optical pulses P, B2 outputting pulses at a wavelength substantially equal to 2*λ3; a device R for recombining the pulses from the generators; a parametric amplifier A receiving the output of the recombination device R as an input; a filter F2 extracting, from the output of the parametric amplification device A, a band centered about a wavelength equal to 2*λ; a second harmonic generator NL receiving the output of the filter F2, at the input; a filter F3 centered about a wavelength equal to λ, extracting the second harmonic wavelengths of the pulses produced by the second harmonic generator NL.
Abstract:
A generator of short optical pulses includes: a generator of optical pulses with a wavelength equal to λ/2 and a spectral width less than λ/3; a generator of optical pulses of a duration less than 10 picoseconds at a wavelength λ/3; a device for recombining the pulses from the generators; a parametric amplification device receiving the output of the recombination device as input; a filter extracting, from the output of the amplification device, a band centered about a wavelength λ; a second harmonic generator receiving the output of the filter and generating a band centered over a wavelength λ/2; and a programmable device making it possible to temporally adjust the pulses corresponding to the bands, in order to allow for the generation of a pulse with a wavelength equal to λ/3 and of a duration less than the period of the optical cycle.
Abstract:
A device for compensating time dispersions applied to the generation of ultra-short pulses, includes: two transparent optical diffraction gratings (RA, RB), which are identical and parallel to each other, operating on the principle of the Bragg diffraction, and two identical prisms (PA, PB), placed head to tail, in the space separating the optical diffraction gratings (RA, RB), knowing that the outer faces (FeA, FeB) of the prisms are parallel to each other and form a non-zero angle (γ) with the faces of the optical diffraction gratings.
Abstract:
The present invention is notably directed to methods and systems for generating a CEP-stable optical pulse of optical carrier frequency fi from input optical pulses, the input optical pulses having an optical carrier frequency fp and pulse duration Tp. A birefringent medium, a non nonlinear medium, a dispersive optical system, a parametric device (DFG) are successively used to achieve the generation.