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:
The invention relates to a method and device for controlling the amplitude of the wavelength spectrum of ultra-short light pulses emitted by multipass laser amplifiers. According to the invention, a programmable acousto-optic device (8) is introduced into a laser cavity of a multipass amplifier (10), in order to modify slightly the amplitude of the spectrum of the light pulse with each passage, owing to a collinear or quasi-collinear interaction between the light pulse and a sound beam, the result from the filtering being used on the non-diffracted direct light beam from the acousto-optic interaction.
Abstract:
The method involves filtering wavelength spectrum amplitude of light pulse at a set of passages using a programmable acoustic-optical device (8). The device (8) filters amplitude based on collinear or quasi-collinear interaction between the light pulse and an acoustic beam. The result of the filtering is worked on a non diffracted direct light beam of acoustic-optical interaction. An independent claim is also included for a device for implementing a wavelength spectrum amplitude controlling method.
Abstract:
Dispositif pour la compensation de la dispersion temporelle appliquée à la génération d'impulsions lumineuses ultra brèves comprenant deux réseaux de diffraction optiques RA, RB identiques et parallèles et deux prismes PA, PB identiques placés à l'intérieur des susdits réseaux de diffraction optiques RA, RB, sachant que les susdits réseaux de diffraction optiques RA, RB sont des réseaux de phase en volume fonctionnant en transmission sur le principe de diffraction de Bragg, les faces extérieures FeA, FeB des susdits prismes PA, PB étant parallèles aux susdits réseaux de diffraction optiques RA, RB et les faces intérieures FiA, FiB des susdits prismes PA, PB étant parallèles entre elles.
Abstract:
Device for adaptation of a programmable generator of ultra short wide spectral band light pulses, to long narrow spectral band light pulses comprising a laser source (1) of ultra-short wide spectral band pulses, a device (2) for dispersion of ultra-short pulses output from said laser source (1), a first non-linear optical mixer (4) to mix long modulated pulses output from said dispersion device (2) with long quasi-monochromatic signals output from a pure frequency pump laser (3), a generator (5) of wide spectral band light pulses placed on a first channel (V1), a second non-linear optical mixer (6) to mix the channel output from said generator (5) and a second channel (V2) emerging from said first non-linear optical mixer (4).