Diffraction effects on degenerate transverse laser modes

Author

Hurvits, T. ; Ruschin, S. ; Keselbrener, M.

Author_Institution

Fac. of Eng., Tel Aviv Univ., Israel

fYear

1995

fDate

7-8 March 1995

Abstract

The influence of intracavity non-circular apertures on the frequency of degenerated transverse modes is studied and measured in a CO/sub 2/ laser. Beats were detected due to degeneracy lifting and their frequency was measured as a function of aperture´s parameters. The effect of mirror tilt on the beat frequency was also measured and attributed to diffraction, since the limiting aperture is driven off-axis by the tilt. An analytical model based on Gaussian aperture was developed for the case of a symmetric slit introduced in the resonator, and experimental results mere confirmed also by numerical simulations. Cooperative frequency locking was observed in all cases, and the critical beat frequency for this effect was determined.

Keywords

carbon compounds; gas lasers; laser mirrors; laser modes; light diffraction; CO/sub 2/; Gaussian aperture; beat frequency; cooperative frequency locking; degeneracy lifting; degenerate transverse laser modes; diffraction effects; intracavity noncircular apertures; mirror tilt; symmetric slit; Analytical models; Apertures; Frequency measurement; Gaussian processes; Laser mode locking; Laser modes; Laser theory; Mirrors; Optical diffraction; Optical resonators;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical and Electronics Engineers in Israel, 1995., Eighteenth Convention of

Conference_Location

Tel Aviv, Israel

Print_ISBN

0-7803-2498-6

Type

conf

DOI

10.1109/EEIS.1995.513830

Filename

513830