A 100 J 1 ns Nd:glass Laser for Optical Parametric Chirped Pulse Amplifiers Pumping

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

“…The first two OPAs (OPA I and OPA II) 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 1.2 ns pulse [25]. The pump intensity at the input of the OPAs had almost uniform cross-sectional distribution and was about 1 GW/cm 2 .…”

“…Pump laser for final OPA Nd:YLF laser described earlier in [25] is directed to the input of a Nd:glass amplifier. The amplifier system consists of a scheme that forms spatial beam structure, a sixstage neodymium phosphate glass laser amplifier and a second harmonic generator.…”

“…The key idea of the beam forming system [30] is that at the output of the aperture line the field in the Fresnel diffraction region has a different configuration. We chose a plane with a large filling factor and relayed its image to the plane of apodizing aperture based on quartz lens [25]. This prevented formation of a diffraction-induced ring structure.…”