Optimizing VCSEL mirrors for improving temperature response

Coherent light generators – Particular active media – Semiconductor

Reexamination Certificate

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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.

REFERENCES:
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patent: 5497381 (1996-03-01), O'Donoghue et al.
patent: 5497389 (1996-03-01), Kasukawa et al.
patent: 6341138 (2002-01-01), Peters et al.
patent: 6556607 (2003-04-01), Jewell
patent: 6980579 (2005-12-01), Jewell
patent: 7103081 (2006-09-01), Nomaguchi
patent: 7312581 (2007-12-01), Roach

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