Coherent light generators – Particular beam control device – Optical output stabilization
Patent
1981-09-08
1983-08-09
Sikes, William L.
Coherent light generators
Particular beam control device
Optical output stabilization
372 29, 356350, H01S 313
Patent
active
043982930
ABSTRACT:
Frequency stabilization is disclosed for a two-mode laser, such as a Zeeman aser. The emission frequency of the laser is servo-stabilized to the center of the atomic gain curve to provide a stable laser reference frequency that is independant of time and enviromental operating conditions. Stabilization in a longitudinal-field Zeeman laser is achieved by utilizing the mode-pulling effect which makes the frequency difference between the two circular polarization components have a parabolic dependence on the optical frequency of the laser. The detected intermode beat frequency from the laser is subjected to digital phase-sensitive, drift-free integration, utilizing a reversible counter, to provide a cumulative count with a rate of increase corresponding to the displacement of the average wavelength from the atomic center wavelength and an analog error-correction signal is generated therefrom which is coupled to the laser. The error-correction signal is processed and coupled to the piezoelectric crystal which controls the emission frequency of the laser for fast laser frequency correction control, and may be also processed and coupled to the heater coil on the laser for thermally providing slow frequency correctional control.
REFERENCES:
patent: 4284964 (1981-08-01), Maier, Jr.
Baer Thomas M.
Hall John L.
Kowalski Frank V.
Englert Alvin J.
Pawlikowski Eugene J.
Scott Leon J.
Sikes William L.
The United States of America as represented by the Secretary of
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