Multicascade boradband optical parametric chirped pulse amplifier based on KD*P crystals

Abstract

We have experimentally demonstrated the existence of super-broadband non-degenerated phase matching for a signal with a wavelength of 911 nm in KD*P crystal pumped with wavelength of 527nm. Parametric amplification coefficient of more than 10 7 in three cascades is achieved. This resulted in pulse energy 10mJ at the output of third cascade. It is shown that in the KD*P crystal chirped pulses of conventional femtosecond sources (a Ti:Sa laser at 911 nm and a Cr:forsterite laser at 1250 nm) can be amplified up to the level that ensures multipetawatt power after compression.

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

“…The master femtosecond oscillator can be lasers operating at a signal wavelength of 910 nm (Ti:sapphire) or at an idler wavelength of 1250 nm (Cr:forsterite). 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 .…”

Compact 0.56 Petawatt laser system based on optical parametric chirped pulse amplification in KD*P crystals

“…In addition, studies [20,21] showed that ultra-broadband phase matching at the central wavelength of signal radiation of 910 nm can be achieved in the KD*P crystal due to the peculiar properties of KD*P Sellmeier equation. It makes possible to amplify 10-15 fs pulses, which are shorter than those in KDP by a factor of 2.5.…”

Method of aligning a four-grating compressor for the petawatt-class PEARL-X laser system

“…The duration of the input pulse was minimized by parallel shifting of the gratings by means of translators. The residual angular dispersion was controlled in two orthogonal planes by an imaging spectrograph [4]. The residual angular dispersion, if any, was removed by aligning the fourth grating.…”

“…Pulses with a peak power of 0.56 PW [3] were generated at IAP RAS on the subpetawatt laser complex PEARL (PEtawatt pARametric Laser) based on the ОРСРА with frequency conversion in a nonlinear DKDP crystal [4]. The original hybrid prism-grating stretcher of this system [5] and the compressor [6] with a two-grating scheme matched to the fourth-order phase dispersion inclusive.…”

“…After alignment, the output radiation of the compressor and, hence, of the laser system as a whole must have minimal pulse duration, uniform distribution of duration over the beam, and high intensity contrast. The radiation must be collimated and free from amplitude front tilt and angular chirp [2].Pulses with a peak power of 0.56 PW [3] were generated at IAP RAS on the subpetawatt laser complex PEARL (PEtawatt pARametric Laser) based on the ОРСРА with frequency conversion in a nonlinear DKDP crystal [4]. The original hybrid prism-grating stretcher of this system [5] and the compressor [6] with a two-grating scheme matched to the fourth-order phase dispersion inclusive.…”