Effects of Chirp Match and Synchronization Jitter on Gain in Optical Parametric Chirped Pulse Amplification

The method for determining the chirp matched parameter has been proposed by studying the variation of the total gain of OPCPA with the pump optical chirped parameters and the corresponding relationship of signal optical and pump optical wavelengths. Taking nonlinear BBO crystal as a typical example, the effects of chirp match and synchronization jitter on gain in optical parametric chirped pulse amplification have been studied. The results show that the gain spectrum width is greatly broadened by chirp matched method to compensate gain narrowing. For the case of the time synchronization, both sides of the signal optical pulse are amplified efficiently and the gain curve is considerably symmetrical for chirp matched case. While for the case of the relatively large synchronization jitter, the signal optical gain and the gain curve are quite different for different pump optical chirped parameters. It is also concluded that for a given chirp matched degree, with the synchronization jitter increasing, the shifting of gain curve is more obvious and gain curve of signal optical pulse is more asymmetric, and the corresponding gain is lower.