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紫外超短脉冲激光系统是钛宝石固体激光器和KrF准分子气体激光器混合系统,由钛宝石前端提供经放大的红外超短脉冲,经三倍频后转变为紫外超短脉冲,最后被KrF准分子气体激光器放大。由于KrF准分子激光器的增益中心为248.4 nm,增益带宽约为1 nm,所以要精确控制输出的红外超短脉冲的频谱中心来适合KrF的增益中心。由KrF的增益中心决定了红外超短系统输出的脉冲频谱中心必须落在744~746 nm,而红外超短系统本身输出的脉冲的最佳工作点并不在744~
The ultra-violet ultrashort pulse laser system is a mixed system of Ti: Ge solid laser and KrF excimer gas laser. The ultra-short infrared pulse amplified by the Ti: sapphire front end is converted to ultraviolet ultrashort pulse by the triplet frequency, and finally the KrF excimer Gas laser amplification. Since the KrF excimer laser has a gain center of 248.4 nm and a gain bandwidth of about 1 nm, the spectral center of the output infrared short pulse is precisely controlled to fit the KrF gain center. The center of the pulse spectrum output by the KrF gain center must fall within the range of 744 to 746 nm and the best operating point of the pulse output by the infrared short system itself does not fall within the range of 744 ~