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首页> 外文期刊>Applied optics >Continuous-wave laser spectrometer automatically aligned and continuously tuned from 11.8 to 16.1 μm by use of diode-laser-pumped difference-frequency generation in GaSe
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Continuous-wave laser spectrometer automatically aligned and continuously tuned from 11.8 to 16.1 μm by use of diode-laser-pumped difference-frequency generation in GaSe

机译：连续波激光光谱仪利用GaSe中的二极管激光泵浦差频生成功能自动对准并从11.8μm连续调谐到16.1μm

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摘要

We report a fully automated mid-IR difference-frequency spectrometer with a spectral resolution under 70 MHz pumped by a pair of conventional room-temperature 800-900-nm diode lasers. 0.1 μW of tunable cw radiation is produced from incident-diode powers of 120 and 75 mW. The system has computer-controlled beam alignment with compact CCD cameras, motorized mirrors and positioners to obtain 0.01° crystal-angle positioning, 4-μm beam overlap at the nonlinear crystal, and automated diode laser beam collimation. Computer-operated firequency control uses temperature tuning and current tuning of the free-running diode lasers. The system has been demonstrated by successfully scanning, without any human intervention, 64 randomly selected acetylene absorption lines between 12 and 15 μm. Spectral scans of ammonia are also presented. This mid-IR spectrometer is suitable for fully automated spectroscopy of an unlimited list of mid-IR frequencies and has the potential to detect any trace gas that has an acceptable absorption line within the large tuning range.
机译：我们报告了由一对传统的室温800-900-nm二极管激光器泵浦的具有70 MHz以下光谱分辨率的全自动中红外差频光谱仪。通过120和75 mW的入射二极管功率产生0.1μW的可调谐CW辐射。该系统具有计算机控制的光束对准功能，包括紧凑型CCD相机，电动反射镜和定位器，可实现0.01°晶体角定位，在非线性晶体上具有4μm的光束重叠以及自动的二极管激光光束准直。计算机控制的火警频率使用自由运行的二极管激光器的温度调节和电流调节。该系统已通过在没有任何人为干预的情况下成功扫描了12至15μm之间的64条随机选择的乙炔吸收线进行了验证。还显示了氨的光谱扫描。该中红外光谱仪适用于无限制的中红外频率列表的全自动光谱学，并且有可能检测在大调谐范围内具有可接受吸收线的任何痕量气体。

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