Frequency-selected Q-switched electron-beam-controlled discharge CO laser

L. A. Afanas'ev; Andrei A. Ionin; Yurii M. Klimachev; Andrei A. Kotkov; Leonid V. Seleznev; Dmitrii V. Sinitsyn; Henry Kobsa

doi:10.1117/12.248623

26 August 1996 Frequency-selected Q-switched electron-beam-controlled discharge CO laser

L. A. Afanas'ev, Andrei A. Ionin, Yurii M. Klimachev, Andrei A. Kotkov, Leonid V. Seleznev, Dmitrii V. Sinitsyn, Henry Kobsa

Author Affiliations +

Proceedings Volume 2788, High-Power Lasers: Gas and Solid State Lasers; (1996) https://doi.org/10.1117/12.248623
Event: Lasers, Optics, and Vision for Productivity in Manufacturing I, 1996, Besancon, France

Abstract

A frequency selected (FS) Q-switched (QS) e-beam controlled- discharge (EBCD) CO-laser has been researched and developed. The laser generates short pulses (tauout approximately 1 - 10 microseconds) having different spectral contents including single line one with 4.95 - 6.50 micrometer spectral range. A special optical scheme has been chosen, which has enabled us to study an influence of spectral contents of CO laser radiation 'locked' or 'blocked' inside a laser resonator on output energy and efficiency of lasing on selected wavelengths. The influence of laser mixture contents, gas pressure and temperature, laser pulse length and spectral width upon the laser characteristics also has been studied. A use of frequency selection and Q-switching decreases the laser efficiency dramatically from approximately 30% for non-selected (NS) free-running (FR) mode of operation down to approximately 0.5% (tauout equals 5 microseconds) for optimal wavelength (lambda approximately 5.3 micrometer) and to 0.1% at the long wave edge of laser spectrum (lambda approximately 6 micrometer). Output energy and laser efficiency strongly depend on the number of short pulses in a train for a single electrical pumping pulse. For instance, eight short pulses lasing (tauout approximately 5 microseconds) has increased the output energy up to approximately 0.5 J (0.6 J/l Amagat) and efficiency up to 0.6%. For some wavelengths the output energy and laser efficiency of FS QS CO laser does not strongly depend on temperature within 100 - 150 K interval. Comparative analysis of NS FR, FS FR, NS QS and FS QS mode of operation of carbon monoxide laser has been done.

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L. A. Afanas'ev, Andrei A. Ionin, Yurii M. Klimachev, Andrei A. Kotkov, Leonid V. Seleznev, Dmitrii V. Sinitsyn, and Henry Kobsa "Frequency-selected Q-switched electron-beam-controlled discharge CO laser", Proc. SPIE 2788, High-Power Lasers: Gas and Solid State Lasers, (26 August 1996); https://doi.org/10.1117/12.248623

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KEYWORDS

Gas lasers

Pulsed laser operation

Energy efficiency

Laser resonators

Q switches

Carbon monoxide

Q switched lasers

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