He-Ne laser frequency stability measuring system and measuring method thereof

Abstract

The invention discloses a He-Ne laser frequency stability measuring system, aiming to overcome the defects that the traditional system is only suitable for a normal environment and can not measure the frequency stability of a laser in environments of vibration, quickly changing temperature and the like. In the whole measuring system, an iodine stabilizing He-Ne laser is used as a frequency standard, an optical fiber measuring head is used to lead laser emitted from the He-Ne laser to be detected out from environments of vibration or quickly changing temperature to form interference with the iodine stabilizing He-Ne laser and generate stable beat frequency signals. Signal processing, such as filtering, amplifying, noise removing and the like, is carried out on the beat frequency signals through a special beat frequency signal measuring system to obtain a beat frequency value, the beat frequency value is transmitted to a computer through a USB interface for displaying and storing, and afrequency stability value is obtained through calculation. The invention has the advantages of leading out laser to be detected, isolating environment influences and keeping the polarization characteristics of the laser to be detected. The invention is suitable for measuring the He-Ne laser in the environments of vibration, quickly changing temperature and the like.

Description

technical field [0001] The invention belongs to the field of laser technology, specifically a system for measuring the frequency stability of He-Ne lasers based on the principle of beat frequency detection, and is mainly used for high-precision measurement of the frequency stability of He-Ne lasers. Background technique [0002] At present, there are many methods for measuring laser frequency stability, such as: direct measurement using spectrometers and interferometers, beat frequency measurement using iodine-stabilized He-Ne lasers as frequency standards, and based on harmonic optical frequency chains, optical Optical frequency measurement methods such as frequency comb technology. Optical frequency measurement methods based on technologies such as optical frequency combs cannot be widely used due to technical difficulties and complex systems; although direct measurement methods using spectrometers and interferometers are simple, they are only suitable for low stability an...

AI Technical Summary

Problems solved by technology

However, this system can only measure lasers in normal environments, and cannot reliably measure lasers in environments such as vibration and rapid temperature changes, because the frequency stability of He-Ne lasers is limited under vibration conditions and rapid temperature changes. Changes have a great impact on its normal use, so it is necessary to develop corresponding measuring instruments to measure it

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