1064nm激光诱导等离子体开关控制355nm脉宽可调输出

为得到脉宽可控的355nm紫外脉冲激光输出,采用1064nm脉冲激光诱导等离子体开关技术,控制355nm激光脉冲宽度,在激光电离Cu小孔内壁表面及空气击穿共同作用下,获得了2.8ns～10ns的脉宽可调输出.讨论了1064nm单脉冲输出能量对脉宽压缩的影响,在无延时情况下得到了脉宽最短达2.8ns的脉冲激光输出.在此基础上,保持1064nm单脉冲输出能量不变,采用延时装置改变两光路间的光程差,以控制等离子体开关相对于355nm激光脉冲的形成时间,最终得到脉宽可调的脉冲激光输出.结果表明,等离子体开关结构简单、操作方便、适用范围广,是一种较好的脉冲整形手段.

Controlling the width-tunable 355nm pulses by means of 1064nm laser-induced plasma shutter

In order to obtain the width-tunable 355nm pulses,a 1064nm laser-induced plasma shutter was used to control the pulse width of 355nm pulses.The width tunable from 2.8ns to 10ns was obtained under the interaction of ionization of the Cu pinhole and the atmospheric breakdown.Firstly,the effect of 1064nm pulse energy on pulse compression was discussed,and the shortest output pulse with a width of 2.8ns was obtained without delay time between two laser paths.Subsequently,adopting the device for delay-time to vary the optical differences between two paths,the width-tunable 355nm laser pulses were obtained.Experimental results indicate that laser-induced plasma shutter is a better pulse-shaping means with simple configuration,convenient operation,and widespread applications.