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Excitation of Copper Vapor Lasers by Storage Capacitor Direct Discharge via High-Speed Photothyristors

  • LASER PHYSICS AND LASER OPTICS
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Abstract

The possibility of using a “pulsed fiber laser–photothyristor” optocoupler as a switch in the excitation schemes of copper vapor lasers (CVLs) has been investigated. It has been shown that such a switch has a nanosecond performance and is able to form monopolar and alternating current pulses through CVLs with a power of up to 10 MW and a repetition rate of tens of kilohertz when an electrical efficiency of the excitation circuit is more than 95%. A simple but very accurate model of a photothyristor is proposed, which can be used in full-scale CVL modeling programs.

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Notes

  1. For this, it is necessary to reduce lifetime of nonequilibrium charge carriers τ to about 1 μs. The usual high-voltage photothyristors [18] are inoperable at such τ due to the low efficiency of the injection mechanism of conductivity modulation. However, a decrease in τ to 1 μs has practically no effect on the pulse characteristics of the photothyristor at photoionization almost uniform in crystal volume and current pulse duration <0.1 μs, but ensures its operation at frequencies up to tens of kilohertz.

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ACKNOWLEDGMENTS

I am grateful to S.N. Yurkov and T.T. Mnatsakanov, who provided the opportunity to simulate the switching process using the program “NVESTIGATION”, as well as N.M. Lepekhin and M.M. Malikov for fruitful discussion of a number of issues raised in this paper.

Funding

This work was executed with the support of the Russian Foundation for Basic Research, grant no. 16-08-01292.

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  1. NPO ENERGOMODUL, 109052, Moscow, Russia

    A. S. Kyuregyan

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  1. A. S. Kyuregyan
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Correspondence to A. S. Kyuregyan.

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Translated by N. Petrov

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Kyuregyan, A.S. Excitation of Copper Vapor Lasers by Storage Capacitor Direct Discharge via High-Speed Photothyristors. Opt. Spectrosc. 126, 388–393 (2019). https://doi.org/10.1134/S0030400X19040131

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