Chirped pulse optical parametric amplifier noise filtering method and apparatus

The present invention belongs to the field of laser technology, in particular to a method of optical parametric chirped pulse amplifier noise filtering spatial beam implantation using modified chirp, which is mainly composed of a modified injection beam spatial chirp generation, optical parametric amplification, spatiotemporal unloading chirp and spatial filtering of four steps: by injection into the space of the chirp signal beam is modified such that various noise signals and optical parametric amplification process results having different temporal and spatial characteristics of the output terminal; spatial and temporal distribution of the noise light field coupling occurs, and thus the spatial filter may be equivalent to the temporal filtering window member, the effective implementation of the noise filtered out. For the process of optical parametric chirped pulse noise common to the amplification process, including ultra-parametric fluorescence, the noise transfer pump and the end face of the optical element caused by the reflection of the pre-pulse and the like, have good filtering effect; linear filtering and spatial filtering belongs, the filtering process without loss of energy of the main pulse, can be used for ultra-high power ultrashort laser pulses SNR system.