Solid-state laser compensated for pumping-light astigmatism
AssigneeHitachi, Ltd.
InventorsTatsuya Tomaru, Hrvoje Petek
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Abstract
In a solid-state laser in which a gain crystal is polished to have the Brewster angle or a solid-state laser comprising a dichroic concave mirror to which light enters at an incidence angle which is not zero, astigmatism generally occurs in pumping light. By tilting a focusing lens for pumping light with respect to the optical axis of the pumping light, the astigmatism is compensated. The tilting angle is determined in such a manner that synthetic focusing points in the sagittal and tangential planes, of a series optical system of a focusing lens, a dichroic concave lens, and a gain crystal are calculated and the focusing points almost coincide with focusing points in a cavity mode.
Claims16
A solid-state laser comprising a laser cavity which introduces pumping light into a gain crystal via a focusing lens and a dichroic concave mirror, wherein the focusing lens is tilted with respect to the optical axis of the pumping light so that a focusing point of the pumping light in a sagittal plane and a focusing point of the pumping light in a tangential plane in the gain crystal almost coincide with focusing points in the respective planes in the gain crystal in a cavity mode.
A solid-state laser comprising:
- (a) a laser cavity having a gain crystal and two end mirrors;
- (b) a pumping light source for supplying pumping light to be led to the gain crystal;
- (c) a dichroic concave mirror for introducing the pumping light to the gain crystal and constructing the laser cavity or deriving outgoing light;
- and
- (d) a lens for focusing the pumping light on the inside of the gain crystal in the laser cavity,
- wherein the focusing lens is tilted with respect to the optical axis of the pumping light so that the focusing point of the pumping light in a sagittal plane and that in a tangential plane in the gain crystal almost coincide with the focusing points in the respective planes in the gain crystal in the cavity mode.
Dependencies are inferred from the claim text.