二次谐波转换对激光脉宽影响的实验研究  

Study on the effect of second harmonic conversion on the pulse width

作　　者：陈波[1] 刘华[1] 苏春燕[1] 叶金祥[1] 夏彦文[1] 谢旭东[1] 

机构地区：[1]中国工程物理研究院高温高密度等离子体物理国家重点实验室,四川绵阳919988信箱621900

出　　处：《强激光与粒子束》2000年第F11期127-130,共4页High Power Laser and Particle Beams

基　　金：国防科技基础研究基金资助课题

摘　　要：实验研究了 KDP晶体二次谐波转换非线性效应对脉宽测量精度的影响。结果表明 :在小信号近似下 ,长度为 1～ 3cm的 KDP 类晶体 ,对于近高斯脉冲 ,其基频脉宽与倍频脉宽存在 2的关系 ;对于非近高斯脉冲 ,基频脉冲半宽与倍频脉冲波形的 1 /4高宽相等 ;在输入功率密度和能量转换效率较高时 ,基频与倍频脉宽无固定关系。The non-linear 2nd-harmonic conversion effect of the KDP crystal is re searched and its effect to measurement accuracy of the laser pulse width. Experimental results show that: i n condition of small signal and Gaussian beams, the 1st-harmonic laser pulse width is 2 t imes of that of the 2nd-harmonic one with type Ⅱ KDP crystal whose thickness is 1～3cm; Due to the non-Gaussian beams, the half -width of the 1st-harmonic pulse equals to the quarter width of the 2nd-harmonic pulse. With higher power density and energy conversion efficiency, the rate between the 1st-harmonic pulse width and the 2nd-harmonic one vary seriously.

关 键 词：KDP晶体 二次谐波转换 非线性效应 脉冲宽度 测量精度 实验研究 激光测量 

分 类 号：TN247[电子电信—物理电子学] TM935.41[电气工程—电力电子与电力传动]