Device for generating or detecting electromagnetic...

Coherent light generators – Particular resonant cavity – Specified cavity component

Reexamination Certificate

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C372S043010, C372S045010, C372S050124, C372S050210, C257S080000, C257S098000, C257S072000

Reexamination Certificate

active

07933305

ABSTRACT:
A device for generating or detecting electromagnetic radiation includes a substrate, a gain medium provided on the substrate, a plurality of reflectors for confining electromagnetic radiation at a predetermined frequency range and substantially perpendicular to a face of the substrate, and spacer means for spacing the reflectors from each other at a predetermined distance, with the gain medium being sandwiched between the reflectors. The gain medium has a quantum well structure formed of a semiconductor material, and gives a gain to electromagnetic radiation by transitioning between subbands created in at least a quantum well in the quantum well structure. The spacer means is formed of a material different from a material of the gain medium.

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