Novel HCN laser cavity length adjusting mechanism

Abstract

The invention discloses a novel HCN laser cavity length adjusting mechanism, which comprises a stepping motor, a high-precision micrometer head and a piezoelectric ceramic, wherein the stepping motoris connected to the high-precision micrometer head; the high-precision micrometer head is connected with a vacuum flange through a corrugated pipe spring, the vacuum flange is connected with an insulating flange with the same size, the insulating flange is connected to a laser cathode sealing gland, six vacuum lead columns are machined on the cathode sealing gland, the front end of the high-precision micrometer head is connected with a screw which penetrates out of the center of the cathode sealing gland, a packaging cylindrical piezoelectric ceramic is directly connected to the screw, and thefront end of the piezoelectric ceramic is connected with a plane mirror. The mechanism provided by the invention can provide output power adjustment with the precision of 2m and difference frequencyadjustment with the precision of 10nm for HCN dual lasers, and provides a guarantee for continuous and stable output of the HCN dual lasers.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a novel HCN laser cavity length adjustment mechanism. Background technique [0002] Far-infrared laser interferometers have been widely used to detect plasma density in Tokamak devices, while HCN laser interferometers are used in EAST, HT-7 and J-TEXT devices. The HCN laser interferometer is an extrapolated Mach-Zehnder interferometer, which requires frequency modulation to generate a difference frequency signal, and the dual laser method is an excellent method for frequency modulation. For dual lasers, maintaining good stability of their output power and difference frequency is the key to the application of dual lasers. The adjustment of the output power and difference frequency of the HCN dual laser is realized by changing the length of the laser discharge cavity, and the adjustment of the cavity length is realized by adjusting the horizontal displacement of the cathode plane...

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Problems solved by technology

[0003] In the prior art, the journal article J.B.ZHANG, Y.X.JIE, H.Q.LIU, X.C.WEI, et al. Outputpower stability of a HCN laser using for the EAST interferometer system, Journal of instrumentation, November 11, 2015. introduced the EAST tokamak At present, an electric platform is used to control the HCN single laser cathode chamber adjustment mechanism with a push rod, but the whole device has many parts, complicated installation, and the adjustment accuracy cannot meet the needs of HCN dual laser difference frequency adjustment.

The journal article G.Li, X.C.Wei, H.Q.Liu, Development of an HCN dual laser for the interferometer on EAST, PlasmaScience and Technology, Vol.19, Jun.20, 2017. Introduced the use of piezoelectric ceramic micro-stages for HCN The preliminary experiment of the difference frequency adjustment of the dual lasers has achieved certain results, but the output power adjustment and the difference frequency adjustment have not been combined, and the adjustment accuracy needs to be further improved

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