Abstract
We propose a precision measurement method of laser linewidth based on short-delay
self-homodyne, using the second peak-valley difference (SPVD) feature
of the coherent power spectrum to fit laser linewidth. The SPVD model
of the self-homodyne coherent envelope spectrum was established.
One-to-one correspondence among the values of SPVD, the delay length,
and the laser linewidth was determined theoretically and through
simulations, while the reliability and stability of the method was
verified experimentally. By comparing the detected results, it is
found that the fitted laser linewidth obtained by the self-homodyne
system is closer to its true value than that obtained by the
self-heterodyne system. Hence, the simpler structure of the
short-delay self-homodyne coherent envelope laser linewidth
measurement method proposed is expected to substitute the previous
laser linewidth measurement method, including complex short-delay
self-heterodyne coherent envelope laser linewidth measurement method
and traditional self-homodyne/heterodyne laser linewidth measurement
method, to achieve more precise laser linewidth value.
Funder
National Natural Science Foundation of China
Science and Technology Planning Project of Guangdong Province
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering
Cited by
4 articles.
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