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基于非线性差频技术,利用AgGaS2晶体通过二类相位匹配条件(e+o→e)产生了5～12.5μm宽调谐差频激光(DFG)输出。抽运光源是一个再生激光放大系统,它由连续的Littrow结构光栅外腔半导体激光器和锥形半导体放大器组成,调谐范围为760～790nm,最大输出功率可达800mW(780nm)。信号光源是连续可调谐钛宝石激光器,调谐范围为790～910nm,最大输出功率可达760mW(806nm)。差频激光在7.0μm附近获得的最大输出功率为1.076μW。基于产生的差频激光,采用直接吸收光谱方法测量了实验室大气中的水汽在7.0μm附近(000→010)吸收带的吸收光谱。在19.0cm的吸收光程条件下,依据记录的大气中水汽的吸收光谱获得了实验室大气中水汽的浓度。
Based on the nonlinear frequency difference technique, a 5 ~ 12.5μm wide tuned difference frequency laser (DFG) output is produced by the AgGaS2 crystal through the second phase matching condition (e + o → e). The pumping light source is a regenerative laser amplification system consisting of a continuous Littrow structured grating external cavity semiconductor laser and a tapered semiconductor amplifier with a tuning range of 760 to 790 nm and a maximum output power of 800 mW (780 nm). The signal light source is a continuously tunable Ti: sapphire laser with a tuning range of 790 to 910 nm and a maximum output power of 760 mW (806 nm). The maximum output power of the difference frequency laser near 7.0μm is 1.076μW. Based on the generated difference frequency laser, the absorption spectrum of water vapor in the laboratory near 7.0 μm (000 → 010) was measured by direct absorption spectroscopy. Under the condition of 19.0 cm absorption optical path length, the concentration of water vapor in the laboratory atmosphere was obtained based on the recorded absorption spectra of water vapor in the atmosphere.