Observation of undamped pulsations in a low-pressure, far-infrared laser and comparison with a simple theoretical model

Year: 1985

Authors: Abraham N.B., Dangoisse D., Glorieux P., Mandel P.

Autors Affiliation: Bryn Mawr College, Bryn Mawr, PA; Istituto Nazionale di Ottica, Firenze, Italy;
Dip. di Fisica, Università di Firenze, Italy;
Lab. de Spectroscopie Hertzienne, Associé au Cenre Nazional de la recherche Scientifique, Lille I, Universite, Villeneuve-d’Asq, France;
Universite Libre de Brussels, Service de Chimie-Physique II, Belgium

Abstract: Experimental details of undamped pulsations are presented for a low pressure, far-infrared (FIR) laser optically pumped by a single-freqeuncy CO2 laser in a standing-wave configuration for both the pumping and the FIR lasing action. Spontaneous pulsing in the single-mode HC00H FIR laser at 742 microns was observed when the cavity was tuned to the FIR resonance and when the CO2 laser of high intensity was sufficiently detuned from the resonance of the pump transition to excite two distinct velocity groups of molecules to contribute the the FIR gain. Theoretical results, based on studies of a model for a laser with two distinct resonant species forming the gain medium, provide a basis for understanding the origin of these instabilities. The model compares satisfactorily with the observed FIR instabilities including the variations in pulsing frequencies observed experimentally as the CO2 laser is detuned.

Journal/Review: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B: OPTICAL PHYSICS

Volume: 2 (1)      Pages from: 23  to: 34

KeyWords: carbon dioxide lasers; far infrared radiation; infrared lasers
DOI: 10.1364/JOSAB.2.000023

Citations: 29
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