Pattern competition in a high-power CO2-laser due to optogalvanic modulation of the pump profile

Year: 1994

Authors: Arecchi F.T., Boccaletti S., Ciofini M., Meucci R.

Autors Affiliation: Istituto Nazionale di Ottica, Largo E. Fermi 6, 50125 Firenze, Italy;
Department of Physics, University of Firenze, 50125 Firenze, Italy

Abstract: Experimental evidence of periodic alternation of different transverse modes in a high-power CO, laser is interpreted in terms of local cooling of the discharge column, which corresponds to the maximum emitted intensity. Optogalvanic coupling between emitted intensity and local discharge impedance values yields a transverse redistribution of discharge current and, hence, of laser gain. Thus, besides the fast feedback provided by the cavity, with high-power lasers one must account also for a slow global feedback because of the optogalvanic effects.

Journal/Review: OPTICAL ENGINEERING

Volume: 33 (1)      Pages from: 97  to: 101

KeyWords: INFRARED TECHNOLOGY; TRANSVERSE EFFECTS IN OPTICS; MODE COMPETITION IN LASERS; TRANSVERSE OPTICAL PATTERN FORMATION; PERIODIC ALTERNATION; OPTOGALVANIC EFFECT
DOI: 10.1117/12.151552

Citations: 2
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