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为差分测量NO2气体浓度,获得448.1 nm与449.15 nm的双波长双脉冲光源具有重要价值。实验中采用分时高压方波驱动电光Ω开关,在一次闪光灯抽运条件下,在同一光路上实现了双波长、双脉冲的Cr:LiSAF可调谐激光输出。利用一块波长为900 nm倍频切割的LBO晶体,进行腔外的双波长双脉冲的谐波研究,实现单光束双波长、双脉冲Cr:LiSAF调Q谐波激光输出,获得了波长分别为448.1 nm与449.15 nm同光束双波长激光输出,脉冲能量分别为13.7 mJ,脉冲间隔62μs。输出的谐波光束线宽小于0.02 nm。
For the differential measurement of NO2 gas concentration, it is of great value to obtain dual-wavelength, double-pulsed light sources of 448.1 nm and 449.15 nm. In the experiment, the time-division high-voltage square-wave driven electro-optic Ω switch was used to realize the dual-wavelength and double-pulse Cr: LiSAF tunable laser output on the same optical path under one flash pumping condition. By using a LBO crystal with a wavelength of 900 nm, the double-wavelength and double-pulse harmonics of the cavity were studied, and the single-beam dual-wavelength and double-pulse Q: LiSAF Q-switched laser output was obtained. nm and 449.15 nm with the same wavelength laser beam output, the pulse energy were 13.7 mJ, pulse interval 62μs. The output harmonic beamwidth is less than 0.02 nm.