Laser frequency stabilization

Details Laser frequency stabilization Laser frequency stabilization

1989-08-30

1990-11-20

Davie, James W.

Coherent light generators

Particular beam control device

Optical output stabilization

372 38, H01S 313

Patent

active

049724258

ABSTRACT:
Frequency stabilization in an RF excited carbon dioxide waveguide laser (10, 110, 210, 310) is obtained by employing as an imput to a dither stabilization feedback circuit (24, 124, 224, 324) an RF return power signal (62) that is a reflection of the exciting RF signal caused by mismatch of RF power source (14, 114, 214, 314) impedance and impedance of the laser cavity. The laser is operated so as to keep the RF return power from having its minimum magnitude. By employing an RF return power signal that is never at its minimum value, the system is insensitive to a wide range of thermal variation, and need for an optical laser output power sensor is eliminated.

REFERENCES:
patent: 4694458 (1987-09-01), Midavaine et al.
patent: 4856010 (1989-08-01), Wissman et al.
Pearson, G. N. and Hall, D. R.; "RF-Excited Tunable CO Laser with opto-Hertzian Frequency Stabilization"; IEEE Journal of Quantum Electronics, vol. 25, No. 3; Mar. 1989; pp. 245-248.
Jackson, P. E., Abramski, K. M. and Hall, D. R.; "Automatic Impedance Matching and Opto-Hertzian Effect in RF Excited CO.sub.2 Waveguide Lasers"; Appl. Phys. B 47, 149-157 (1988).

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