Yumoto Masaki, Kawata Yasushi, Wada Satoshi
Photonics Control Technology Team, RIKEN Center for Advanced Photonics, RIKEN 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan.
Mid-Infrared Laser Source Laboratory, RIKEN Baton Zone Program, RIKEN, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan.
Sci Rep. 2022 May 12;12(1):7879. doi: 10.1038/s41598-022-12019-5.
The development of mid-infrared (mid-IR) tunable lasers has been driving various laser spectroscopic technologies. Herein, we report wavelength-scanning cavity ring-down spectroscopy (WS-CRDS) in the mid-IR region using an electronically tuned Cr:ZnSe (ET-Cr:ZnSe) laser, which could achieve a nanosecond pulse operation, with broad wavelength tuning of 2-3 µm. This allowed WS-CRDS-induced trace detection of the refrigerant, CHF. A CHF detection limit of 0.66 ppm (3σ), and the detection of trace HO in CHF was realized using the broad wavelength-tuning range feature, demonstrating the effectiveness of the ET-Cr:ZnSe laser in WS-CRDS. We believe that our method would accelerate the development of various trace-gas detection technologies.
中红外（mid-IR）可调谐激光器的发展推动了各种激光光谱技术。在此，我们报告了使用电子调谐的Cr:ZnSe（ET-Cr:ZnSe）激光器在中红外区域进行的波长扫描腔衰荡光谱（WS-CRDS），该激光器可实现纳秒脉冲操作，波长调谐范围为2 - 3微米。这使得通过WS-CRDS能够对制冷剂CHF进行痕量检测。实现了CHF的检测限为0.66 ppm（3σ），并利用宽波长调谐范围特性检测了CHF中的痕量HO，证明了ET-Cr:ZnSe激光器在WS-CRDS中的有效性。我们相信我们的方法将加速各种痕量气体检测技术的发展。
