Coherent light generators – Particular operating compensation means
Patent
1991-03-15
1992-09-01
Lee, John D.
Coherent light generators
Particular operating compensation means
372 34, H01S 300
Patent
active
051446324
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. An automatic initialization routine is also disclosed for selecting the starting etalon operating temperature in order to maximize the output power of the laser.
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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 Inc.
Lee John D.
Wise Robert E.
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