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US 6,819,692 B2Granted
Optical amplifiers and lasers
AssigneesMassachusetts Institute of Technology, The Regents of the University of California
InventorsVictor I. Klimov, Alexandre Mikhailovski, Jennifer A. Hollingsworth, Catherine A. Leatherdale, Moungi G. Bawendi
Life of this patent
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Abstract
An optical amplifier and laser having both broad band and wide range specific band capability can be based on semiconductor nanocrystal solids.
Claims50
A laser comprising:
- an optical gain medium comprising a concentrated solid including a plurality of semiconductor nanocrystals, the plurality of semiconductor nanocrystals being close-packed;
- and
- a cavity arranged relative to the optical gain media to provide feedback, wherein the concentrated solid provides gain to an optical signal at an energy equal to or less than the maximum band gap emission of the nanocrystals.
A method of amplifying an optical signal comprising:
- directing an optical beam into a gain medium including a concentrated solid including a plurality of semiconductor nanocrystals, the plurality of semiconductor nanocrystals being close-packed and having an rms deviation in diameter of less than 15% wherein the concentrated solid is substantially free of defects and provides gain to the optical signal at an energy equal to or less than the maximum band gap emission of the nanocrystals when excited by a source.
A method of forming a laser comprising:
- arranging a cavity relative to an optical gain medium to provide feedback to the optical gain medium, wherein the optical gain medium comprises a concentrated solid including a plurality of semiconductor nanocrystals, the plurality of semiconductor nanocrystals being close packed.
A laser comprising:
- an optical gain medium comprising a concentrated solid including a plurality of colloidally grown semiconductor nanocrystals, the plurality of semiconductor nanocrystals being close-packed and having an rms deviation in diameter of less than 15%;
- and
- a cavity arranged relative to the optical gain media to provide feedback, wherein the concentrated solid provides gain to an optical signal at an energy equal to or less than the maximum band gap emission of the nanocrystals.
A method of amplifying an optical signal comprising:
- directing an optical beam into a gain medium including a concentrated solid including a plurality of colloidally grown semiconductor nanocrystals, the plurality of semiconductor nanocrystals being close-packed and having an rms deviation in diameter of less than 15%, wherein the concentrated solid is substantially free of defects and provides gain to the optical signal at an energy equal to or less than the maximum band gap emission of the nanocrystals when excited by a source.
A method of forming a laser comprising:
- arranging a cavity relative to an optical gain medium to provide feedback to the optical gain medium, wherein the optical gain medium comprises a concentrated solid including a plurality of colloidally grown semiconductor nanocrystals, the plurality of semiconductor nanocrystals being close packed and having an rms deviation in diameter of less than 15%.
Dependencies are inferred from the claim text.