Solid state laser device
AssigneeFuji Electric Co., Ltd.
InventorRyohei Tanuma
Life of this patent
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Abstract
For high energy density and improved processing performance of a solid-state laser, the product .theta.d of a laser beam with divergence .theta. and beam diameter "d" at the beam waist is reduced. Formation of an non-oscillating region as in an output mirror with a pinhole is prevented by use of a hole-type mirror with a central region having reduced reflectance. For increased range of stable oscillation, a beam expander is interposed between a laser medium and the output mirror. The focused beam of a slab laser is made circular by using a columnar light-guiding path on the output side of the output mirror. A laser beam is more readily admitted into an optical fiber by use of a conical light-guiding path. With a hole-type output mirror, two-component laser output from a slab laser has very small .theta.d values.
Claims35
A solid-state laser device for emitting a laser beam, comprising:
- (a) a total reflection mirror;
- (b) means for reducing the .theta.d of said laser-beam, wherein said reducing means includes an output mirror having an inside surface and an outside surface, said inside surface facing said total reflection mirror, and being of high reflectance except at a predetermined central region and of low reflectance at said predetermined central region;
- and
- (c) a solid-state laser medium disposed between said total reflection mirror and said inside surface of said output mirror.
A solid-state laser device for emitting a laser beam, comprising:
- (a) a total reflection mirror;
- (b) means for reducing the .theta.d of said laser beam, wherein said reducing means includes:
- (i) a partially permeable output mirror having an inside surface and an outside surface, said inside surface facing said total reflection mirror;
- and
- (ii) means, disposed at a predetermined distance from said outside surface of said output mirror, for splitting said laser beam into a plurality of laser output beams;
- and
- (c) a solid-state laser medium disposed between said total reflection mirror and said inside surface of said output mirror, wherein said solid-state laser medium is a slab-shaped solid-state laser medium having two opposing, optically polished sides, so that said laser beam will advance while repeating full reflection alternately on said optically polished sides.
Dependencies are inferred from the claim text.