Synchronization of three master oscillators for multi-petawatt OPCPA laser system

Optical parametric chirped pulse amplification (OPCPA) is widely used instead of traditional chirped pulse amplification in femtosecond lasers. In this paper we describe synchronization of the cw femtosecond Cr:forsterite laser with two Q-switched Nd:YLF master oscillators, In experiment we achieved a jitter between the cw fs Cr:forsterite laser and the Nd:YLF master oscillator as low as 100ps and jitter between two Nd:YLF master oscillators as low as 200ps. It satisfies requirements for the multi-petawatt OPCPA laser system.