Abstract:
A device for the temporal shaping of the amplitude and phase of ultrashort pulses, comprising: - a birefringent waveguide 1 of main axis Δ consisting of a nematic liquid crystal 2 located between a photoconductive material 3 and a substrate 4, - two transparent electrodes, one of which 5 is located between said nematic liquid crystal 2 and said substrate 4, and the other 6 such that said photoconductive material 3 is located between said other electrode 6 and said nematic liquid crystal 2, and - projection optics 7 for projecting a programmable optical mask 8 onto said photoconductive material 3.
Abstract:
The invention relates to a system for generating short optical pulses having a very high temporal contrast at a wavelength λ, including: 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 said 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 said 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.
Title translation:DISPOSITIF POUR LA PROGRAMMATION EN AMPLITUDE ET EN PHASE&IMPULSIONS LUMINEUSES LONGUES BANDE SPECTRALE ETROITE A PARTIR D'UN MODULATEUR D'IMPULSIONS LUMINEUSES BREVES A BANDE SPECTRALE。
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).