Abstract

The wavelength modulation indices are measured based on harmonic amplitude ratio of 4f_(amp)/6f_(amp) (4f_(amp) and 6f_(amp) are the 4- and 6-th harmonic central peak amplitudes correspondingly) with the Doppler-free selective reflection modulation spectroscopy. The experiments for the 6S_(1/2)(F = 4) ? 6P_(3/2)(F' = 5) transition of cesium D_(2) line with 30-MHz linewidth were carried out. The 4f- and 6f-harmonic signals were detected with two digital lock-in amplifiers separately. The maximum error for modulation indices measurement was ±0.1 within the range of m from 3 to 6. The non-linear modulation behaviour of an external cavity diode laser induced by voltage tuning was studied with this method. The method for modulation indices measurement does not require a solid etalon as usual for measuring the wavelength modulation depth and the absorption linewidth correspondingly.

© 2005 Chinese Optics Letters

Low-frequency wavelength modulation spectroscopy with D₂ transition of atomic cesium by use of an external-cavity diode laser

Liantuan Xiao, Changyong Li, Qian Li, Suotang Jia, and Guosheng Zhou
Appl. Opt. 39(6) 1049-1052 (2000)

Measurement of group refractive indices of glass using a color-selective multi-pulse generated with a spatial light modulator

Hisanari Takahashi, Koyo Watanabe, Kyohhei Shigematsu, Takashi Inoue, and Hiroshi Satozono
Opt. Lett. 46(7) 1534-1537 (2021)

Real-time measurement of wavelength selectivity of reflection holograms

Hiroaki Yamamoto, Koichi Maeda, Satoshi Ishizuka, and Toshihiro Kubota
Appl. Opt. 31(35) 7397-7399 (1992)

Large amplitude wavelength modulation spectroscopy for sensitive measurements of broad absorbers

Torrey R. S. Hayden and Gregory B. Rieker
Opt. Express 24(24) 27910-27921 (2016)

Calibration-free wavelength-modulation spectroscopy for measurements of gas temperature and concentration in harsh environments

Gregory B. Rieker, Jay B. Jeffries, and Ronald K. Hanson
Appl. Opt. 48(29) 5546-5560 (2009)