1 petawatt OPCPA laser in Russia: Status and expectations

This study reports the construction of a Russian OPCPA-based laser complex. In this system, a 100 TW laser is taken as a front-end system, supplemented with a KD*P crystal with clear aperture of 20times20 cm, as another cascade of parametric amplification. The pump laser comes from one channel of the "Luch" facility with 2 kJ output pulse energy at the wavelength of 1054 nm. In addition, a 1 kJ pulse with 2.3 ns duration at the second harmonic is used to pump the final stage of the parametric amplifier. Data reveals that the maximum energy obtained in a chirped pulse is more than 100 J. Autocorrelation function on compression is also shown. If the pulse shape is regarded to be Gaussian, then its pulse duration is 70 fs, which corresponds to the power of 1 PW at compressor output. Lastly, beam divergence shows a value close to the diffraction limit.