Affiliation:
1. Shanghai Institute of Optics and Fine Mechanics (SIOM), Chinese Academy of Sciences
Abstract
The delayed self-heterodyne and self-homodyne (DSH) method is widely used for measuring the line shapes of high coherent lasers. This method results in an autocorrelation of a laser line under the condition of a delay that is much larger than its coherent time. In practice, the delay is often not so long, especially for very narrow linewidth lasers, resulting in errors in rebuilding the laser’s line shape from the DSH line. Many papers were devoted to the topic, but most of them are based on the formula for white noise. Analytical formulas of phase variance for
1
/
f
noises are presented in this paper; the DSH line shapes for different noise types and different delay lengths are simulated based on the formulas. Some experimental data of the DSH line, combined with the power spectral density of frequency noise, are processed, showing good agreement with the theoretical analysis. It is indicated that the DSH line shape shows complicated behaviors varied with the delay, with noise types, and with the measurement duration. Such effects are to be compensated for in retrieving the laser’s linewidth from the DSH data.
Funder
National Natural Science Foundation of China
National Key Research and Development Program of China
Strategic Priority Research Program of Chinese Academy of Sciences
Youth Innovation Promotion Association of the Chinese Academy of Sciences
Natural Science Foundation of Shanghai
Shanghai Sailing Program
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering
Cited by
1 articles.
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