Fixed wavelength laser using multiorder halfwave plate

Details Fixed wavelength laser using multiorder halfwave plate Fixed wavelength laser using multiorder halfwave plate

1989-12-13

1991-04-30

Gonzalez, Frank

Coherent light generators

Particular beam control device

Mode discrimination

372105, 372106, H01S 3098

Patent

active

050124730

ABSTRACT:
A laser adapted to operate at a constant, predetermined wavelength includes the following elements disposed in order within a laser cavity and aligned along the path of light flow therethrough: a highly reflective rear mirror, a halfwave plate, a Brewster window, an active laser medium, and an output coupler. The halfwave plate is designed to rotate incident light beams by 180.degree. at the predetermined wavelength and to rotate incident light beams by an amount other than 180.degree. at wavelengths other than the predetermined wavelength. In a preferred embodiment, the Brewster window is a thin film polarizer designed for the predetermined wavelength.

REFERENCES:
patent: 3407364 (1968-10-01), Turner
patent: 3435371 (1969-03-01), White
patent: 3824492 (1974-07-01), Brienza et al.
patent: 3858963 (1975-01-01), Riley
patent: 4084883 (1978-04-01), Eastman et al.
patent: 4176327 (1979-11-01), Wayne et al.
patent: 4305046 (1981-12-01), Le Floch et al.
patent: 4515441 (1985-05-01), Wentz
David L. J. Lunt, Thin-Film Polarizers, Burleigh Northwest Optical Inc. 11/82.
Thin Film Polarizers, 1/87, Two--Six Incorporated.
Control of the Laser Wavelength, 1981 Engineering Technology.
Hecht and Zajac, Optics, Addison-Wesley Publishing, Reading, Mass., 1979 pp. 244-249.

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