Fjodorow Peter, Frolov Mikhail P, Korostelin Yuri V, Kozlovsky Vladimir I, Schulz Christof, Leonov Stanislav O, Skasyrsky Yan K
Opt Express. 2021 Apr 12;29(8):12033-12048. doi: 10.1364/OE.422926.
We demonstrate an intracavity absorption spectroscopy system based on a broadband single-crystal pulsed Fe:ZnSe laser. The laser operates at room-temperature and is continuously tunable in the spectral range of 3.76-5.29 µm. The long-wavelength emission up to 5.29 µm is a record achievement for Fe:ZnSe lasers, to the best of our knowledge. The developed laser system is applied for measurements of gaseous absorption inside the laser resonator. We demonstrate sensitive detection of (i) CO isotopes in the atmosphere and in human breath, (ii) CO in breath (after cigarette smoking) and in the smoke of a smoldering paper, and (iii) NO in a gas flow. The achieved detection limits are: 0.1 ppm for CO and CO, 3 ppm for CO, and 1 ppm for NO. The sensitivity of the current system is primarily limited by the short pump-pulse duration of 40 ns. Possibilities for sensitivity enhancement by up to a factor of 10 are discussed.
我们展示了一种基于宽带单晶脉冲Fe:ZnSe激光器的腔内吸收光谱系统。该激光器在室温下运行，可在3.76 - 5.29 µm的光谱范围内连续调谐。据我们所知，高达5.29 µm的长波长发射是Fe:ZnSe激光器的一项创纪录成果。所开发的激光系统用于测量激光谐振腔内的气体吸收。我们展示了对以下物质的灵敏检测：（i）大气和人类呼出气体中的CO同位素；（ii）呼出气体（吸烟后）和闷烧纸张烟雾中的CO；以及（iii）气流中的NO。所达到的检测限为：CO和CO为0.1 ppm，CO为3 ppm，NO为1 ppm。当前系统的灵敏度主要受限于40 ns的短泵浦脉冲持续时间。讨论了将灵敏度提高多达10倍的可能性。
