New scheme of a petawatt laser based on nondegenerate parametric amplification of chirped pulses in DKDP crystals

200 Terawatt femtosecond laser based on optical parametric amplification in DKDP crystal

“…We used an original stretcher (transmission band 1000 см -1 ) that comprised two prisms between the standard diffraction gratings. As a result, a 600 ps pulse at a wavelength of 910 nm was efficiently compressed 28,30 using an ordinary compressor. The first two OPAs were pumped by the second harmonic of a single-mode single-frequency Nd:YLF laser with a wavelength of 527 nm, up to 1 J energy in a 1.5 ns pulse.…”

“…The OPA III was pumped by second harmonic of a five-stage Nd:phosphate amplifier. Part of the fundamental harmonic radiation of the Nd:YLF laser was directed through a multistage spatial filter to the input of this amplifier 30,32 . The amplifier worked with a period of one shot in 30 minutes and ensured output second harmonic pulse energy of 80 J at pulse duration of 1.2-1.5ns and beam diameter of 8 cm.…”

“…Good prospects of the second option were demonstrated in 29 . Later on a laser with 0.44TW power was created based on a two-stage optical parameteric amplifier 28,30 . Adding one more amplifier provided laser power of 100 TW 31 .…”

<title>Russian megajoule laser facility Iskra-6: creation, investigation and parameter optimization of basic module Luch</title>

“…In this scheme the conditions of wide-band synchronism of parametric amplification are realized due to proper selection of a non-linear crystal, propagation directions and frequencies of pump and signal waves and, at the same time, the scheme of consecutive stretching of a chirp-modulated pulse traditional for super-high field generation, its many-stage amplification and compression of an amplified pulse are implemented. It is the fact of great importance that recently in Russia [9][10][11][12] (VNIIEF, lAP RAS) and in Great Britain [13] (Rutherford Appleton Laboratory) a possibility of parametric amplification up to the level of tens of Joules was demonstrated at the spectrum width of -25-70 nm, compressed pulse duration of-70 fs and laser power after compression of 130 TW.…”

Target technology development for the research of high energy density physics and inertial fusion at the RFNC–VNIIEF

“…Experiments in the following basic directions (Il'kaev & Garanin, 2006) are being developed at high-power monopulse laser installations ISKRA-3 (Gaidash et al, 1974), ISKRA-4 (Cormer, 1980), ISKRA-5 (Annenkov et al, 1991), BEAM (Besnasiuk et al, 2002), FEMTO (Andreev et al, 2004): (1) dynamics of compression of direct and indirect irradiation fusion targets; (2) influence of target irradiation asymmetry on output parameters (three-dimensional (3D) compression of fusion fuel, temperature of compressed deuterium-tritium (DT) gas, and neutron output); (3) X-radiation transfer into the indirect irradiation targets; (4) the equation-of-state of substances; (5) influence of the turbulent mixing; and (6) physics of X-ray laser operation. Experiments in the following basic directions (Il'kaev & Garanin, 2006) are being developed at high-power monopulse laser installations ISKRA-3 (Gaidash et al, 1974), ISKRA-4 (Cormer, 1980), ISKRA-5 (Annenkov et al, 1991), BEAM (Besnasiuk et al, 2002), FEMTO (Andreev et al, 2004): (1) dynamics of compression of direct and indirect irradiation fusion targets; (2) influence of target irradiation asymmetry on output parameters (three-dimensional (3D) compression of fusion fuel, temperature of compressed deuterium-tritium (DT) gas, and neutron output); (3) X-radiation transfer into the indirect irradiation targets; (4) the equation-of-state of substances; (5) influence of the turbulent mixing; and (6) physics of X-ray laser operation.…”