Abstract
We have developed a novel laser heterodyne radiometer using a fiber-coupled distributed feedback laser as the local oscillator to perform spectroscopic measurements of small molecules in the near-infrared (NIR) spectral region. Here, we demonstrate measurement of HCN and ${{\rm{CO}}_2}$ in the lab and ${{\rm{CH}}_4}$ and ${{\rm{CO}}_2}$ in the atmospheric column. In addition, we demonstrate detection of a neutral iron, Fe(I), Fraunhofer line in the spectrum of the sun, at a vacuum wavelength of 1559.252 nm, that can be used to calibrate the wavelength scale of the instrument and enable verification of proper system operation for field applications.
© 2021 Optical Society of America
Full Article | PDF ArticleMore Like This
Andrew D. Sappey, Pat Masterson, and Ben A. Sappey
J. Opt. Soc. Am. B 37(12) 3829-3840 (2020)
Andrew D. Sappey, Bernard P. Masterson, and James Howell
Appl. Opt. 61(10) 2697-2705 (2022)
Hao Deng, Chenguang Yang, Zhenyu Xu, Mingxing Li, An Huang, Lu Yao, Mai Hu, Bing Chen, Yabai He, Ruifeng Kan, and Jianguo Liu
Opt. Express 29(2) 2003-2013 (2021)