Double-longitudinal-mode laser heat frequency stabilization method and device based on iodine frequency stabilization reference light

Abstract

A double-longitudinal-mode laser heat frequency stabilization method and a device based on the iodine frequency stabilization reference light belong to the application technical field, the invention takes the center frequency of the iodine frequency stabilization laser with a relative frequency accuracy being 10<-11> as a reference frequency, and leads the frequency of laser output by multi-double-longitudinal-mode lasers to keep one fixed difference with the reference frequency through regulating cavity length, so that the relative frequency accuracy of the double-longitudinal-mode laser is improved from 10<-7>-10<-8> to 10<-9>, the frequency consistency of multi-double-longitudinal-mode lasers is improved from 10<-7> to 10<-9>, therefore, the problems that the relative frequency accuracy of the double-longitudinal-mode laser can not exceed 10<-8> and the frequency consistency of multi-double-longitudinal-mode lasers is poor are solved.

Description

technical field [0001] The invention belongs to the technical field of laser applications, in particular to a thermal frequency stabilization method and device for dual longitudinal mode lasers based on iodine frequency stabilization reference light Background technique [0002] Good monochromaticity is one of the important characteristics of the laser. Theoretical analysis shows that the laser has a very small single-mode linewidth limit, but in practical applications, due to the interference of unstable factors such as temperature, vibration, air flow and laser tube discharge current, it runs freely. The frequency drift of the laser is far greater than the theoretical linewidth limit, and its relative frequency accuracy is only 10 -5 ~10 -6 . However, in the ultra-precision measurement of aerospace equipment, microelectronics manufacturing and other fields, the relative frequency accuracy of the laser light source is required to be as high as 10 -7 ~10 -8 , and to 10 ...

AI Technical Summary

Problems solved by technology

However, the introduction of the auxiliary optical cavity leads to the complexity of the entire device structure, and the auxiliary optical cavity uses piezoelectric ceramic elements, which reduces the vibration resistance of the device

[0010] In summary, based on piezoceramic adjustment and locking in 127 I 2 Iodine frequency-stabilized lasers on ultra-fine absorption lines, although the relative accuracy of the center frequency is at or better than 10 -11 , and the consistency of the center frequencies of multiple iodine frequency-stabilized lasers reaches 10 -11 , but due to the shortcomings of poor anti-vibration performance and high working environment requirements, it cannot be directly applied to industrial field measurements; the dual longitudinal mode frequency-stabilized laser based on electrothermal devices has a simple structure and good environmental adaptability, and has been widely used, but its Relative frequency accuracy is difficult to break through 10 -8 , and the frequency consistency between multiple dual longitudinal mode frequency stabilized lasers can only reach 10 -6 ~10 -7 , in the case where multiple lasers need to be used for multi-dimensional synchronous measurement, this will bring the problems of wavelength reference, wavelength drift and spatial coordinate inconsistency, which will affect the comprehensive measurement accuracy of the interferometric system; bias frequency locking based on piezoelectric ceramics The relative accuracy of the frequency between the He-Ne laser and the dual longitudinal mode frequency-stabilized laser using iodine absorption frequency-stabilized technology reaches 10 -9 , but the structure is complex and the anti-vibration ability is poor, and the applicable occasions are strictly limited

It can be seen that the existing frequency-stabilized laser technology will be difficult to meet the requirements of the development of a new generation of ultra-precision processing and measurement technology

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