采用光克尔快门提升激光脉冲对比度

Improvement of laser pulse contrast by optical Kerr shutter

为了有效地提升激光脉冲对比度,提出采用光克尔快门技术对激光主脉冲进行选通来消除主脉冲前后的噪声。将激光脉冲分成两束,一束作为快门光控制光克尔快门,另一束作为待选通的光脉冲,这两束光在光克尔介质中空间交叉。调节光克尔快门的打开时间使其针对激光主脉冲进行选通,使在光克尔快门之外的光均被阻挡,由此有效地提升激光脉冲对比度。实验结果显示,光克尔快门持续时间为570 fs,选通效率为17%,激光脉冲对比度提升了大约104倍,表明采用光克尔快门选通技术能够有效地提升激光脉冲对比度。

In order to improve the laser pulse contrast,an optical Kerr shutter was used to select the main pulse to restrain the noise of the main pulse.The laser was split into two beams.One of them was used as a gate light to control the optical Kerr shutter,and the other was to be cleaned.The two beams were spacial crossed in optical Kerr materials.The open time of the optical Kerr shutter was controlled to select the main pulse,while the light outs of the shutter were blocked.Therefore,the laser pulse contrast was enhanced.The experiment result showed that the duration and the transmission ratio of the optical Kerr shutter are about 570 fs and 17%,respectively and the pulse contrast has been enhanced by 104 times.The conclusion is that the optical Kerr shutter technology can efficiently enhance laser pulse contrast.