Coherent light generators – Particular active media – Semiconductor
Reexamination Certificate
2005-02-22
2005-02-22
Wong, Don (Department: 2828)
Coherent light generators
Particular active media
Semiconductor
C372S045013, C372S046012, C257S018000
Reexamination Certificate
active
06859474
ABSTRACT:
The invention discloses improved structures of light-processing (e.g. light-emitting and light-absorbing/sensing) devices, in particular Vertical Cavity Surface Emitting Lasers (VCSELs), such as may find use in telecommunications applications. The disclosed VSCAL devices and production methods provide for an active region having a quantum well structure grown on GaAs-containing substrates, thus providing processing compatibility for light having wavelength in the range 1.0 to 1.6 μm. The active region structure combines strain-compensating barriers with different band alignments in the quantum wells to achieve a long emission wavelength while at the same time decreasing the strain in the structure. The improved functioning of the devices disclosed results from building them with multicomponent alloy layers having a large number of constituents. The invention discloses as a key constituent in the proposed alloy layers for the active region a substance, such as nitrogen (N), suitable for reducing bandgap energy (i.e., increasing light wavelength) associated with the layers while at the same time lowering the lattice constant associated with the structure and hence lowering strain.
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Hains et al, Room temperature pulsed operation of triple-quantum-well GAINNAS substrates by MOCVD, IEEE Photonics technology letters, vol. 11, No. 10, Oct. 19999, pp. 1208-1210.*
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Miyamoto et al, Anovel GALNNAS-GAAS quantum-well structure for long wavelength semiconductor lasers, IEEE photonics technology letters, vol. 9, No. 11, Nov. 1997, pp. 1448-1450.*
Johnson et al, Long wavelength pseudomorphic InGaPAsSb type-I and type-II active layers frown on GaAs, 18th north american conference on molecular beam eptaxy, Oct. 1999, vol. 18, No. 3, pp. 1545-1548.
Braun Wolfgang
Dowd Philip
Guo Chang-Zhi
Johnson Shane
Zhang Yong-Hang
Arizona Board of Regents
Gallagher & Kennedy P.A.
MacBlain Thomas D.
Rodriguez Armando
Wong Don
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