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This paper deals with the microstructure of the generated crystals in borate glass by femtosecond laser irradiation, Raman spectroscopy was used to study the distribution of the two phases of barium metaborate crystals produced.
We present a contrast filter reaching 12 orders of magnitude from micro to milliJoule input pulse with 24% efficiency. It solves contrast issue for Petawatt class lasers in microjoule seeded CPA or double CPA scheme.
We describe a high repetition rate laser driven X-ray source and the optimization of the X-ray generation at low energy level. This source was used in time resolved X-ray diffraction to study the coherent acoustic phonon.
A simple, compact and robust implementation of SPIDER using a single long crystal for both ancilla generation and upconversion is demonstrated. It has both high sensitivity and accurate characterization of pulses < 40 fs over the 740 - 900 nm tuning range.
Recent work in frequency-conversion of pulsed fiber-amplifiers is reviewed. Design criteria of frequency converters for fiber sources in operating the wavelength range between 1 um and 2 um are discussed.
We report the light-assisted poling of controllable periodic and arbitrarily-shaped domain patterns in lithium niobate and lithium tantalate via the simultaneous application of a low uniform DC electric-field and sequence of ultrashort pulses (150-200 fs).
First experiments of proton exchange channel waveguides compatible with electric field surface periodic poling of congruent lithium niobate crystals are addressed. Picosecond nonlinear copropagating QPM-SHG measurements have been carried out on such structures.
Computational study of nanosecond pulse laser radiation in periodically poled LiNbO3 crystals reveals the complex spatio-temporal evolution of the 1.064 mum fundamental harmonic and second harmonic energy fields with associated temperature fields, leading to the thermal dephasing and inhibition of second harmonic generation.
Polychromatic beams of hard X-rays from ultrafast laser plasma interaction are studied. Relativistic electrons are accelerated and wiggled by a plasma along a few millimeters. Spectral, spatial characterization and electron/X-ray correlation is presented.
We demonstrate an octave-spanning, self-referenced optical frequency comb produced with a high repetition rate (frep=575 MHz) femtosecond Ti:sapphire laser that requires less that 1 W of 532 nm pump power.
We have demonstrated highly efficient phase conjugation of 1 mum pico-second Laguerre Gaussian modes for the first time. The angular momentum of phase conjugation was also investigated by an interferometric technique.
We demonstrate for the first time Q-switched and mode-locked laser operation of the Li6Y(BO3)3:Yb3+ crystal. Up to 140 muJ pulse energy and down to 355 fs pulse duration were achieved.
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