We demonstrate the high-gain of two double-pass Ho:YLF amplifiers with high-energy seed pulses injection via a modified population inversion Frantz-Nodvik model by numerical simulation. From the numerical simulation results, 26.2 mJ/1 kHz amplified pulses can be obtained by two double-pass amplifiers with 20 μJ/1 kHz, 40 nm (FWHM) bandwidth seed pulses injection. Due to ~1300 gain, the bandwidth of the amplified pulse decreases to about 3.5 nm (FWHM), corresponding to 466 fs pulse duration near 2 μm wavelength. Therefore, the spectrum shaping of seed pulses is induced to suppress the gain narrowing effect. Then, the pulses can be amplified to 22.8 mJ with a spectrum of 16 nm (FWHM), which supports 368 fs pulse duration near 2 μm by simulation.
We report a generation of 10.6% conversion efficiency near 1053 nm first order Stokes pulse in stimulated Raman
scattering pumped using 800 nm Ti:sapphire based femtosecond pulses that are stretched to 460 ps, obtained by use of a
single pass ethonal Raman shifter. The Stokes pulse almost maintains the bandwidth of the pump and is compressed to
~10 ps using a mismatched grating-pair. The spectral characteristic of the Raman pulse is calculated and the results
explain the observed transient features.
We demonstrate high amplified spontaneous emission (ASE) contrast pulses in a Nd:glass laser system based on the hybrid double chirped pulse amplification (double CPA) scheme. By an OPA temporal cleaning device, ~100 uJ/46 fs/ 1011 clean pulses are generated and amplified in the next Nd:glass laser. After compressor, >150 mJ/~0.5 ps/1 Hz pulses can be obtained. The ASE temporal contrast of amplified pulses is ~1011 with energy gain ~2.5×104 in the Nd:glass amplifiers.
Comb-like supercontinuum generation is investigated with dual-pulse filamentation in air. The period of spectral
fringes varies with the time delay between collinearly propagating pulses. The comb-like supercontinuum may be a
potential tool for optical remote sensing.
By directly measuring the spherical wavefront near the focus, we demonstrated a approach to efficiently correct
convergent spherical wavefront by installing a common small aperture deformable mirror (DM) in the middle of
0.89PW/29.0fs Ti:sapphire CPA laser chain. It is, to our knowledge, the first time attain the near perfect correction result
in ultra-intensity laser system by correcting convergent spherical wavefront using a small aperture DM in adaptive
optical loop. Finally the maximum peak intensity of 2.59×10^21 W/cm2 was obtained with an f/4 off-axis parabola at the
output power of 0.89 PW.
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