Coherent light generators – Long wavelength
Reexamination Certificate
2007-01-02
2009-06-16
Harvey, Minsun (Department: 2828)
Coherent light generators
Long wavelength
C372S045012
Reexamination Certificate
active
07548566
ABSTRACT:
The present invention provides quantum cascade lasers and amplifier that operate in a frequency range of about 1 Terahertz to about 10 Terahertz. In one aspect, a quantum cascade laser of the invention includes a semiconductor heterostructure that provides a plurality of lasing modules connected in series. Each lasing module includes a plurality of quantum well structure that collectively generate at least an upper lasing state, a lower lasing state, and a relaxation state such that the upper and the lower lasing states are separated by an energy corresponding to an optical frequency in a range of about 1 to about 10 Terahertz. The lower lasing state is selectively depopulated via resonant LO-phonon scattering of electrons into the relaxation state.
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Hu Qing
Williams Benjamin S.
Engellenner Thomas J.
Harvey Minsun
Massachusetts Institute of Technology
Mollaaghababa Reza
Nutter & McClennen & Fish LLP
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