Coherent light generators – Particular active media – Semiconductor
Reexamination Certificate
2007-12-21
2009-10-20
Harvey, Minsun (Department: 2828)
Coherent light generators
Particular active media
Semiconductor
C372S039000
Reexamination Certificate
active
07606282
ABSTRACT:
Improved slope efficiency in a VCSEL can be accomplished by selecting particular mirror layer compositions and/or mirror layer configurations that minimize increased reflectivity in the top mirror and/or maximize increased reflectivity of the bottom mirror with increasing temperature. Improved reflectivity of the bottom mirror compared to the top mirror over a desired operating temperature range can be facilitated by (i) selecting mirror pairs for the bottom and/or top mirror that gives the bottom mirror pairs a greater increase in contrast ratio with increasing temperature compared to the top-mirror pairs, and/or (ii) including fewer mirror pairs in the bottom mirror than the number of mirror pairs that would give optimal reflectivity.
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Guenter James
Johnson Ralph H.
Finisar Corporation
Harvey Minsun
Nguyen Tuan N.
Workman Nydegger
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