Narrow-Linewidth Pr:YLF Laser for High-Resolution Raman Trace Gas Spectroscopy
Narrow-Linewidth Pr:YLF Laser for High-Resolution Raman Trace Gas Spectroscopy
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DOI：
10.3390/spectroscj1020008
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发表时间：
2023-08
期刊：
影响因子：
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通讯作者：
Charuka Muktha Arachchige;A. Muller
中科院分区：
文献类型：
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作者：
Charuka Muktha Arachchige;A. Muller
自发拉曼气体光谱法是一种多功能的化学鉴别工具，它通常依赖于倍频红外激光源来提供实现痕量浓度化学检测所需的高功率和窄线宽。然而，这些激光器相对较低的效率和较高的复杂性使其难以集成到可现场部署的仪器中。此外，倍频阻止了循环激光功率用于拉曼增强。研究了一种二极管泵浦Pr：YLF激光器作为窄带光源的替代方案，它有可能实现更便携的拉曼散射系统。当用腔内标准具操作时，激光器实现了0.5 cm-1的线宽，当用来自蓝色二极管激光器的3.1 W泵浦时，绿色输出功率为0.37 W，循环功率为16 W。通过分辨空气中重叠的N2/CO和CO2/N2 O拉曼谱带，证明了在大气压下具有高度光谱分辨力的痕量检测。
Spontaneous Raman gas spectroscopy, which stands out as a versatile chemical identification tool, typically relies on frequency-doubled infrared laser sources to deliver the high power and narrow linewidth needed to achieve chemical detection at trace concentrations. The relatively low efficiency and high complexity of these lasers, however, can make them challenging to integrate into field-deployable instruments. Additionally, the frequency doubling prevents the utilization of circulating laser power for Raman enhancement. A diode-pumped Pr:YLF laser was investigated as an alternative narrow-band light source that could potentially realize a more portable Raman scattering system. When operated with an intracavity etalon, the laser realized a linewidth of 0.5 cm−1 with a green output power of 0.37 W and circulating power of 16 W when pumped with 3.1 W from a blue diode laser. Trace detection at atmospheric pressure with a high degree of spectral discrimination was demonstrated by resolving overlapping N2/CO and CO2/N2O Raman bands in air.