【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。更多还原

【Abstract】 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.更多还原