标题： 多线CO激光聚焦对ZnGeP2中宽带和频生成的影响 显示英文标题

标题： Influence of multi-line CO laser focusing on broadband sum-frequency generation in ZnGeP2

摘要： 多线CO激光聚焦对ZnGeP2非线性晶体中宽带和频生成光谱特性的影响进行了实验和数值研究。 在多线CO激光紧聚焦而非单线CO激光的情况下，实验观察到了最大的频率转换。 紧聚焦导致和频生成光谱展宽，并增加了总频率转换效率，即光谱范围内的积分。 这些效应是由于相位匹配带宽和角度色散的增加。 数值上证明了多线CO激光的最大转换效率发生在焦距为单线CO激光焦距0.4倍的位置。 显示英文摘要

摘要： An influence of multi-line CO laser focusing on spectral characteristics of broadband sum-frequency generation in ZnGeP2 nonlinear crystal was experimentally and numerically studied. Maximal frequency conversion was experimentally observed under tight focusing of the multi-line rather than single-line CO laser. The tight focusing resulted in broadening sum-frequency generation spectrum and increasing total, i.e. integrated over the spectrum, frequency conversion efficiency. These effects were due to increasing phase-matching bandwidth and angular dispersion. Maximal conversion efficiency of the multi-line CO laser was numerically demonstrated to take place at the focal length of 0.4 times that for the single-line one.