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Hooting modes in a CO2 waveguide laser

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2 Author(s)
C. A. Hill ; R. Signals & Radar Establ., Malvern, UK ; P. E. Jackson

CO2 waveguide lasers `hoot' when, instead of the solitary resonator mode expected from a homogeneously broadened gas laser, two or more resonator transverse modes laser simultaneously on a common laser line. The unwanted mode or modes, even if very faint and present only occasionally, can impede heterodyne measurements where a clean frequency spectrum is required. The authors report measurements of transverse-mode beat frequencies from a small RF-excited CO2 laser with a hybrid Al/Al2O3 square-bore waveguide and plane mirrors; these frequencies alter with mirror tilt by up to 70 MHz mrad-1. A minimum beat frequency is seen when the laser is well assigned. The authors suggest that a model of the misaligned resonator may help to identify the faint modes responsible for hooting

Published in:

IEEE Journal of Quantum Electronics  (Volume:24 ,  Issue: 10 )