Mirror structure and laser device comprising such a mirror structure
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United States of America Patent
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Aug 17, 2010
Grant Date -
Dec 11, 2008
app pub date -
Dec 22, 2006
filing date -
Dec 22, 2005
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Abstract
For increasing the power emitted by surface emitting lasers and for improving the spatial coherence of the laser beam, emitted in particular by disk lasers, microchip lasers and VCSELs having a relatively wide emitting area, the invention proposes to select a low order transverse cavity mode by means of a mirror structure (12) of high reflectivity, and of high angular selectivity. The mirror structure comprises a multilayer (14) receiving the optical beam (24) and a resonant grating mirror (16) following the multilayer and arranged for highly reflecting the optical beam in a narrow angular range at each side of a determined incidence angle.
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