Abstract

Results of experiments are presented indicating that low-frequency beats detectable from ruby lasers are beats between transverse modes. Three-dimensional resonator theory is reviewed with respect to its applicability to ruby lasers. Agreement between theory and experiment shows that the modes of an excellent optical quality ruby rod are described by nonconfocal resonator theory. Results of beat-frequency measurements with approximately confocal rods are in good agreement with theory. The variation of transverse mode beats with pump energy and temperature indicates that single-frequency operation is possible at room temperature and up to 20% over threshold if axial frequency selection is used.

© 1964 Optical Society of America

Beat Frequencies Between Modes of a Concave-Mirror Optical Resonator

John P. Goldsborough
Appl. Opt. 3(2) 267-275 (1964)

Optical Quality and Radiation Patterns of Ruby Lasers

C. Martin Stickley
Appl. Opt. 2(8) 855-860 (1963)

Investigation of Ruby Optical Maser Characteristics Using Microwave Phototubes

B. J. McMurtry
Appl. Opt. 2(8) 767-786 (1963)

Polarization of the Light Output from a Ruby Optical Maser

J. H. Brunton
Appl. Opt. 3(11) 1241-1246 (1964)

A Scanning Spherical Mirror Interferometer for Spectral Analysis of Laser Radiation

R. L. Fork, D. R. Herriott, and H. Kogelnik
Appl. Opt. 3(12) 1471-1484 (1964)