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The mechanism of single-frequency operation of the hybrid-CO2laser

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3 Author(s)
Gondhalekar, A. ; Universitä Stuttgart, Stuttgart, Germany ; Heckenberg, N.R. ; Holzhauer, E.

The mechanism of a new method of obtaining high-power single-frequency pulses from a TEA-CO2laser is discussed. Measurements of the shape and monochromaticity of pulses from the hybrid laser which has both a TEA and a low-pressure gain section inside one resonator are presented. The mechanism of single-frequency operation of the hybrid laser is discussed with reference to numerical solutions of simplified rate equations. The low-pressure section provides gain only over a narrow range of frequencies so that a mode lying in that bandwidth builds up faster than neighboring modes to give a single-frequency pulse resembling in overall shape the normal TEA laser pulse. If the system is already lasing when the TEA discharge begins, the single-mode radiation already present rapidly grows to give a single-frequency pulse lacking a gain-switched peak.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:11 ,  Issue: 3 )