Development of a passive optical heterodyne radiometer for near and mid-infrared spectroscopy

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

Passive optical heterodyne spectroscopy measurement of the Doppler shift of Fe(I) lines induced by the rotational velocity of the Sun

Andrew D. Sappey, Pat Masterson, and Ben A. Sappey
J. Opt. Soc. Am. B 37(12) 3829-3840 (2020)

Development of a laser heterodyne spectroradiometer for high-resolution measurements of CO₂, CH₄, H₂O and O₂ in the atmospheric column

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)

Precision heterodyne oxygen-corrected spectrometry: vertical profiling of water and carbon dioxide in the troposphere and lower stratosphere

David S. Bomse, Jared E. Tso, Monica M. Flores, and J. Houston Miller
Appl. Opt. 59(7) B10-B17 (2020)

Hollow waveguide-miniaturized quantum cascade laser heterodyne spectro-radiometer

Iain Robinson, Helen L. Butcher, Neil A. Macleod, and Damien Weidmann
Opt. Express 29(2) 2299-2308 (2021)

Mid-infrared laser heterodyne radiometer (LHR) based on a 3.53 μm room-temperature interband cascade laser

J. Wang, G. Wang, T. Tan, G. Zhu, C. Sun, Z. Cao, W. Chen, and X. Gao
Opt. Express 27(7) 9610-9619 (2019)