Mode locked solid-state laser pumped by a non-diffraction-limite

Details Mode locked solid-state laser pumped by a non-diffraction-limite Mode locked solid-state laser pumped by a non-diffraction-limite

1998-04-24

1999-11-16

Scott, Jr., Leon

Coherent light generators

Particular pumping means

Pumping with optical or radiant energy

372 98, 372 18, 372 11, H01S 3091

Patent

active

059870494

ABSTRACT:
A pulsed solid-state laser comprises an optical resonator and a solid-state laser medium placed inside the optical resonator. A saturable absorber, such as a semiconductor saturable absorber mirror device for passive mode locking is placed inside the optical resonator, and a pumping source is provided for exciting the laser gain medium to emit electromagnetic radiation. The pumping source emits pump radiation which impinges on the laser gain medium in the form of a non-diffraction-limited focused pumping beam. The product of the stimulated emission cross section times the spontaneous fluorescence lifetime is low for the laser medium, e.g., 0.1.multidot.10.sup.-23 cm.sup.2 s for Ti:sapphire; nevertheless, the laser yields a high output power of a few Watt even if pumped with a non-diffraction-limited pumping beam. Pumping with a non-diffraction-limited pumping beam makes feasible solid-state lasers with remarkably smaller sizes and lower costs, but with the same performance as known lasers.

REFERENCES:
patent: 5237577 (1993-08-01), Keller et al.
patent: 5345454 (1994-09-01), Keller
patent: 5524011 (1996-06-01), Lawandy
patent: 5701327 (1997-12-01), Cunningham et al.

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