Coherent light generators – Particular beam control device – Optical output stabilization
Patent
1983-11-17
1986-06-10
Davie, James W.
Coherent light generators
Particular beam control device
Optical output stabilization
372 26, 372 29, H01S 310
Patent
active
045947155
ABSTRACT:
A laser having a stabilized external passive cavity is disclosed, with stabilization being effected by modulation of an external mirror positioned along the laser axis. The laser system includes first, second and third spaced mirrors with the second mirror being an output coupler positioned between the first and third mirrors so that an active cavity is defined between the first and second mirrors and a passive cavity is defined between the second and third mirrors. The active cavity feeds, or pumps, the passive cavity which is stabilized by modulation of the third mirror by movement along the laser axis by linear oscillation to Doppler shift the reflected waves within the passive cavity and thereby produce frequencies that do not interfere with the stable modes of the active cavity. By stabilization of the passive cavity, advantages of an intercavity laser device can be realized without incurring the practical disadvantages of such devices, and results in a laser device that is particularly well suited for particle size measurement.
REFERENCES:
patent: 3406289 (1968-10-01), Schleusener
patent: 3534289 (1970-10-01), Clark et al.
patent: 3718868 (1973-02-01), Pao et al.
patent: 3899748 (1975-08-01), Bodlaj
Perel et al, "The Effect of Movement of an Additional Mirror on the Intensity Produced by a Gas Laser", Opt. Spectrosc., vol. 37, No. 3, Sep. 1974, pp. 322-324.
Smith, "Stabilized, Single-Frequency Output from a Long Laser Cavity", IEEE Journal of Quantum Electronics, vol. QE-1, No. 8, Nov. 1965, pp. 343-348.
Davie James W.
Particle Measuring Systems, Inc.
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