Coherent light generators – Particular beam control device – Optical output stabilization
Patent
1989-12-05
1991-07-02
Gonzalez, Frank
Coherent light generators
Particular beam control device
Optical output stabilization
372 29, 372 20, H01S 3137
Patent
active
050291742
ABSTRACT:
A method and system for stabilizing the output frequencies of a multimode laser of the type which operates in at least three optical cavity modes includes detecting the intermodulation product frequency, using a suitable photodetector. The optical cavity modes may be either purely longitudinal for a single transverse mode, or may include radiation from multiple transverse cavity excitations, also with possible longitudinal plurality. The detector output is monitored for the intermodulation product beat signal which is contained in the detector current at the differences of the primary difference frequencies of the optical modes. A signal derived from the frequency of the intermodulation product term is compared with a reference signal, and the resulting error signal is driven to zero by varying the optical length of the laser oscillator cavity in response to the error signal, thereby causing the operating modes of the laser to be stabilized. Possible means of adjusting optical cavity length include, but are not limited to, thermal expansion or contraction of the resonator support structure which is used to establish the relative spacing of the laser's end mirrors, by piezoelectric or magnetostrictive means according to which one or both cavity mirrors is moved to change physical cavity length, or other electro-optic means which may be employed to adjust optical cavity length by control of the refractive index or optical path length presented by an intracavity optical element.
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Anderson Mark W.
DeBell Gary W.
Schultz Robert J.
Feix Donald C.
Freiburger Thomas M.
Gonzalez Frank
Morse Susan S.
Spectra-Physics Inc.
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