摘要
研究了以Ⅰ/Ⅱ类角度失谐设置方式下,高强度激光在KDP晶体中的谐波转换问题。采用了包括三阶非线性、离散及衍射等效应的谐波转换计算模型,详细讨论了在三阶非线性、离散和衍射等效应的情况下,相位扰动与三次谐波转换(THG)效率的关系,绘出了相应的关系曲线。结果表明,相位扰动会使三次谐波转换效率降低,谐波转换效率越高三倍频的调制越小,提高三次谐波转换效率可以抑制相位扰动对其产生的不利影响。
A theoretical analysis is presented for third harmonic conversion in KDP (KH2PO4) for type I/type II angle-detuning scheme of high-intensity laser. Taking into account the third-order nonlinear, transverse walk-off and diffraction, the conversion efficiency of the third harmonic has been calculated. The results show that the efficiency decreases with the phase ripples of the fundamental wave, and the higher of the THG conversion efficiency is, the smaller of the modulate depth of the output intensity of 3ω radiation is, which indicates that by increasing the conversion efficiency the beam quality of the third harmonic can be improved.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2005年第5期647-650,共4页
Chinese Journal of Lasers
基金
中国工程物理研究院与国家自然科学基金会联合基金(10176019)资助项目。
