Coherent light generators – Particular active media – Active media with particular shape
Patent
1989-12-11
1991-09-10
Gonzalez, Frank
Coherent light generators
Particular active media
Active media with particular shape
372 70, 372 75, H01S 306
Patent
active
050480448
ABSTRACT:
Various examples of an optically pumped laser are described. In each example, a laser member formed from active laser material is located in an optical cavity and a source of pumping light is arranged so that pumping light passes into the laser member through a side surface. A deflecting means is provided which ensures that the pumping light makes an initial pass followed by at least one, and preferably at least two, further passes across the laser member. In the further passes, the pumping light has a substantial component long the optical axis. Consequently, a relatively long absorption path for the pumping light is achieved. In one example, the laser member is an Nd:YAG bar (20), the pumping light source is an array (23) of laser diodes, and the deflecting means takes the form of a series of facets (27) formed along a side of the bar (20). In another example, the deflecting means is a diffraction grating.
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Gonzalez Frank
Lumonics Ltd.
Morse Susan S.
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