Coherent light generators – Particular resonant cavity – Unstable resonator
Patent
1990-09-27
1991-04-30
Davie, James W.
Coherent light generators
Particular resonant cavity
Unstable resonator
372 97, 372101, 372103, H01S 308
Patent
active
050124838
ABSTRACT:
A laser cavity providing high power laser radiation with diffraction-limi divergence and narrow-bandwidth comprises: a stable laser cavity including a gain medium, which generates and amplifies laser radiation, optically coupled to first and second reflectors and an optical coupler; and an unstable laser cavity including the gain medium, the first reflector, the optical coupler and a scraper mirror. The scraper mirror is located between the gain medium and the optical coupler for producing an output beam. The stable laser cavity is restricted to operate on a low order TEM mode by an aperture located between the optical coupler and the second reflector. A frequency narrowing element located between the optical coupler and the second reflector narrows the bandwidth of the laser radiation in the stable laser cavity. The optical coupler couples the narrow bandwidth laser radiation from the stable laser cavity to the unstable laser cavity, thereby producing narrow bandwidth laser radiation in the output beam.
REFERENCES:
patent: 4868515 (1989-09-01), Reintjes et al.
Cooper David G.
Dexter James L.
Reintjes John F.
Tankersley Lawrence L.
Davie James W.
Jameson George
McDonnell Thomas E.
The United States of America as represented by the Secretary of
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