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Updated: Jun 12, 2026

Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown
Published on: February 14, 2014
Laser heterodyne spectrometer using a liquid nitrogen cooled tunable diode laser for remote measurements of
Abstract:
A laser heterodyne spectrometer with a tunable diode laser as a local oscillator has been developed for ultrahigh resolution IR spectroscopy of the absorption spectra of trace constituents in the earth's atmosphere. The spectral resolution and SNR of the developed system are 0.0013 cm(-1) and ~500, respectively. This performance is sufficient for retrieving the altitude profile of atmospheric O(3) through an inversion method. The altitude profile of atmospheric N(2)O has been also obtained for the first time with this laser heterodyne technique. The high resolution and high SNR have been accomplished by adopting a tunable diode laser which operates at liquid nitrogen temperature and by developing an effective technique to eliminate the optical feedback of the local oscillator laser beam.
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