Chinese Optics Letters, 2015, 13 (1): 013001, Published Online: Jan. 6, 2015
Optical heterodyne Herriott-type multipass laser absorption spectrometer Download: 653次
Abstract
We present a Herriott-type multipass laser absorption spectrometer enhanced by optical heterodyne detection. The proposal is demonstrated by measuring the spectra of water vapor molecule in the region from 12247.6873 to 12249.6954 cm-1. Compared with direct absorption spectroscopy, the signal-to-noise ratio is improved nearly one magnitude of factor by combining with the optical heterodyne spectroscopy and extra weak absorption lines are observed. The minimum detectable absorption is estimated at 4.36×10-8 cm-1and the measured line shape dominated by Doppler broadening can be precisely recovered by direct transformation of experimental optical heterodyne spectral profile.
Chuanliang Li, Lulu Liu, Xuanbing Qiu, Jilin Wei, Lunhua Deng, Yangqin Chen. Optical heterodyne Herriott-type multipass laser absorption spectrometer[J]. Chinese Optics Letters, 2015, 13(1): 013001.