Laser with actively stabilized etalon for single frequency opera

Details Laser with actively stabilized etalon for single frequency opera Laser with actively stabilized etalon for single frequency opera

1990-04-23

1991-09-10

Gonzalez, Frank

Coherent light generators

Particular operating compensation means

372 20, 372 19, H01S 3106

Patent

active

050480316

ABSTRACT:
An actively stabilized laser is disclosed which includes a temperature tunable etalon in the laser cavity for single frequency operation. The operation of the laser is actively monitored to detect variations induced by changes in the length of the resonator. These changes tend to cause the frequency of the selected longitudinal mode to shift so that it is no longer aligned with the peak of the transmission curve of the etalon. When this misalignment occurs, operation deteriorates. By monitoring laser performance, the misalignment can be detected and the temperature of the etalon can be changed to realign its transmission peak to the selected mode. In the preferred embodiments, either the laser output power or the current supplied to the laser is monitored. This approach substantially reduces mode hopping.

REFERENCES:
patent: 3967211 (1976-06-01), Itzkan et al.
patent: 3987373 (1976-10-01), Mohler
patent: 4081760 (1978-03-01), Berg
patent: 4097818 (1978-06-01), Manoukian et al.
patent: 4782492 (1988-11-01), McMahon et al.
patent: 4914662 (1990-04-01), Nakatani et al.
Coherent Radiation Technical Bulletin, No. 106, dated 1971.
Coherent brochure on Single Frequency Operation.
"Tunable Dye Lasers", T. F. Johnston, Jr., Encyclopedia of Physical Science and Technology, vol. 14, 1987.

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