Effects of synchronization-time jitter in optical parametric chirped-pulse amplification on gain stability

An improved three-wave-coupling model of optical parametric chirped pulse amplification（OPCPA） including the effects of phase mismatching, pulse temporal profile and synchronization-time jitter was presented in this paper. With the model, we investigated and compared the effect of synchronization-time jitter on the gain stability of OPCPA in small signal amplification regime and in saturation regime respectively. The results show that in the case of one nanosecond synchronization-time jitter, the jitter shifts the amplified signal gain spectrum obviously, leads to pulse profile asymmetry and decreases the gain overall. The broader signal spectrum will aggravate the influence of jitter on parametric gain. However, when the parametric amplification is saturated, the impact of jitter upon o