In:
Journal of the Optical Society of America B, Optica Publishing Group, Vol. 38, No. 10 ( 2021-10-01), p. D1-
Abstract:
We have developed an amplified frequency double-shifting loop with a bidirectionally operated acousto-optic modulator as the in-loop frequency shifter to generate a frequency-stepped pulse train (FSPT) with frequency spacing twice as much as its operation frequency. Based on this configuration, a FSPT with 51 equidistant optical frequencies and 800 MHz frequency spacing around 1572 nm was generated, covering the whole R16 absorption peak of C O 2 for direct spectral measurement in the time domain. The retrieved transmission curve from a C O 2 gas cell with concentration of 4.02% is in good agreement with the calculated Voigt lineshape from the HITRAN database. The maximal relative errors between the measured and calculated results are within 0.5% for each optical frequency, indicating its great potential for practical C O 2 monitoring.
Type of Medium:
Online Resource
ISSN:
0740-3224
,
1520-8540
DOI:
10.1364/JOSAB.425720
Language:
English
Publisher:
Optica Publishing Group
Publication Date:
2021
Permalink
