System and method for measuring laser contrast by using chirped pulse

The invention discloses a system and a method for measuring laser contrast by using chirped pulses. The system comprises a collimation and beam splitting device, a main laser energy tuner, a plasma generation device, a probe light delay adjustment device, a probe light spectrum broadening device and a monitoring device, a laser pulse is divided into two light beams through the collimation and beam splitting device, one light beam is main laser, and the other light beam is probe light. The main laser enters the plasma generation device through the main laser energy tuner to generate plasma, and then the main laser returns to the return light monitoring camera; the probe light enters the probe light delay adjusting device, is changed into chirped pulse through the probe light spectrum broadening device, then penetrates through the plasma generating device, carries information in the plasma and enters the monitoring device. 本发明公开了一种利用啁啾脉冲测量激光对比度的系统及方法，包括准直分束装置、主激光能量调谐器、等离子体产生装置、探测光延时调整装置、探测光光谱展宽装置和监测装置；激光脉冲经所述准直