Polarization stabilization of all fiber frontend system for laser facility prototype

The polarization characeristics of the all fiber front-end for a laser facility prototype were analyzed. According to the polarization control demand of the laser facility prototype, a new method was developed to stablize the polarization of the fiber system with narrow bandwidth and short-pulse output. The amplitude modulator of the fiber system was pulse-biased and the autostabilizaion of the fiber system polarization was obtained by on-line detecting the polarization state of CW laser leakage from the amplitude modulaor. The decrease of the extinction ratio of the amplitude modulator in longtime operation was restrained and the stability of the all fiber frontend system was improved to 2.9%．