Narrow-Linewidth Laser Linewidth Measurement Technology

A narrow-linewidth laser with excellent temporal coherence is an important light source for microphysics, space detection, and high-precision measurement. An ultranarrow-linewidth output a linewidth as narrow subhertz has been generated theoretical length over millions of kilometers. Traditional grating spectrum measurement technology wide wavelength scanning range extended dynamic range, but the spectral resolution can only reach gigahertz level. The Fabry–Pérot interferometer megahertz With continuous improvement coherence, requirements are increasing, which also promotes rapid development lasers their applications. In this article, methods research progress reviewed to provide reference researchers engaged in development, measurement, applications lasers.