Coherent light generators – Particular active media – Insulating crystal
Reexamination Certificate
2011-08-09
2011-08-09
Park, Kinam (Department: 2828)
Coherent light generators
Particular active media
Insulating crystal
C372S042000, C372S039000
Reexamination Certificate
active
07995631
ABSTRACT:
A material having a surface and a dopant in the material distributed whereby the material has a spatially variant optical flux density profile. In accordance with the invention, tailored non-uniform gain profiles within a Yb:YAG laser component (rod, slab, disc, etc.) are achieved by a spatial material modification in the spatially masked pre-forms. High temperature-assisted reduction leads to the coordinate-dependent gain profiles, which are controlled by the topology of the deposited solid masks. The gain profiles are obtained by reducing the charge state of the laser-active trivalent Yb3+ions into inactive divalent Yb2+ions. This valence conversion process is driven by mass transport of ions and oxygen vacancies. These processes, in turn, affect the dopant distribution throughout the surface and bulk laser crystal.
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Byren Robert W.
Sumida David S.
Ushinsky Michael
Park Kinam
Pillsbury Winthrop Shaw & Pittman LLP
Raytheon Company
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