Role of noise in the diode-laser spectroscopy of the spectral line profile

Questions concerning precise measurements of the spectral-line-profile parameters by diode-laser spectroscopic methods were examined. The instrumental function of a distributed-feedback diode laser ({lambda} =1.53 {mu}m), consisting of the additive contributions of the noise due to spontaneous emiss...

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Bibliographic Details
Published in:Quantum electronics (Woodbury, N.Y.) N.Y.), 2000-01, Vol.30 (1), p.87-93
Main Authors: Nadezhdinskii, Aleksandr I, Plotnichenko, V V, Ponurovskii, Ya Ya, Spiridonov, Maksim V
Format: Article
Language:English
Subjects:
ABSORPTION
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
DOPPLER BROADENING
ELECTROMAGNETIC RADIATION
EMISSION
EMISSION SPECTRA
FLUCTUATIONS
FUNCTIONS
LASER RADIATION
LASER SPECTROSCOPY
LINE BROADENING
LINE WIDTHS
NOISE
OSCILLATIONS
RADIATIONS
RELAXATION
SORPTION
SPECTRA
SPECTRAL DENSITY
SPECTRAL FUNCTIONS
SPECTROSCOPY
VARIATIONS
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Summary:Questions concerning precise measurements of the spectral-line-profile parameters by diode-laser spectroscopic methods were examined. The instrumental function of a distributed-feedback diode laser ({lambda} =1.53 {mu}m), consisting of the additive contributions of the noise due to spontaneous emission, frequency fluctuations, and intensity fluctuations, was investigated. An analytical formula was obtained for the spectrum of the diode-laser field formed by frequency fluctuations. The spectral density g{sub 0} of the frequency fluctuations, determining the width of the central part of the emission line profile of a diode laser, was found by two independent methods (by fitting to a Doppler-broadened absorption line profile and by finding the intensity of the residual radiation and the saturated-absorption line width). The parameters {Omega} and {Gamma} of the spectral density of the frequency fluctuations, coupled to the relaxation oscillations and determining the wing of the diode-laser emission line profile, were determined experimentally. By taking into account the instrumental function of the diode laser, involving successive convolution with the recorded emission spectra, it was possible to reproduce correctly the spectral line profile and to solve accurately the problem of the 'optical zero'. The role of the correlation between the intensity noise and the diode-laser frequency was considered. (laser applications and other topics in quantum electronics)
ISSN:1063-7818
1468-4799
DOI:10.1070/QE2000v030n01ABEH001665