Method and apparatus for frequency stabilization of accurate separated longitudinal Zeeman laser base on optical power

Abstract

The invention pertains to the technical field of laser application, the method provided by the invention includes the following procedures that the laser tube arranged in a longitudinal magnetic field is turned on and preheated, 1/4 clockwise and counterclockwise circularly polarized lights emitted from the laser tube preliminarily separated by a wave-plate and a polarized light splitter to achieve two orthogonal linear polarized light beams; a low-excursion high-frequency photoelectric detector is used to convert the linear polarized light beams into electric signals and measure the amplitude values of the DC and AC components, so as to accurately separate and measure the optical powers P L and PR of the two circularly polarized light beams; the current value of the electric-heating apparatus wound around the laser tube is adjusted, and the temperature of the laser tube and the length of the resonant cavity are changed to adjust the optical power difference PL-PR to zero, and both polarized optical frequencies are stabilized; the device provided by the invention comprises an optical-power precise separating and measuring circuit used to gain the optical-power DC component and AC component; the invention is characterized in that the low-excursion high-frequency photoelectric detector can simultaneously measure the optical powers of two laser beams (with different frequencies) mixed in the linear polarized light, as a result, the stability of the frequency of a frequency-stabilized LASER is improved.

Description

technical field [0001] The invention belongs to the technical field of laser applications, in particular to a method and device for stabilizing the frequency of a longitudinal Zeeman laser based on precise separation of optical power. Background technique [0002] One of the characteristics of laser is good monochromaticity, and the laser linewidth limit caused by spontaneous emission noise is very small, but due to the influence of various unstable factors, the optical frequency drift of the free-running laser is far greater than the linewidth limit. In the application fields of precision interferometry, optical frequency standard, optical communication and precision spectrum research, laser as a length standard requires good stability of optical frequency (wavelength). Among all frequency-stabilized lasers, longitudinal Zeeman-stabilized lasers have been widely used in the above fields due to their simple structure, dual-frequency emission, moderate frequency difference an...

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Problems solved by technology

However, in order to prevent the asymmetry of the optical path caused by the introduction of the liquid crystal polarization switch, the precision requirements for the processing and installation of the optical components in this scheme are high,

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