Low threshold photopumped Al/sub x/Ga/sub 1-x/As quantum-well heterostructure lasers
Data are presented on very low threshold photopumped separate-confinement quantum-well heterostructure (SC QWH) lasers grown by metalorganic chemical vapor deposition (MOCVD). An unusually thin single quantum well (size L/sub z/< or approx. = 60 A) is employed in the QWH with the carriers confined (''trapped'') in the interior ''cladding'' region, which serves also as the optical waveguide. Excess carriers, which are photogenerated (or injected), are confined in the thin interior cladding region (size L/sub z/' approx.1000 A) and, in this charge reservoir and waveguide region, are thermionically ''emitted'' back and forth across the well until scattered to lower energy in the well (..delta..Eapprox.h..omega../sub LO/) and collected. Continuous (cw) 300 K photopumed laser operation of these QWH's is demonstrated for very short cavities. For one QWH wafer laser operation occurs at lambdaapprox.7730 A with a photopumping threshold of 380 W/cm/sup 2/ (J/sub eq/ approx.160 A/cm/sup 2/) and for another wafer at lambdaapprox.7000 A with threshold 10/sup 3/ W/cm/sup 2/(J/sub eq/approx. 410 A/cm/sup 2/). The photopumped samples are as small as 20 x 40 ..mu..m, thus making these laser thresholds (for such short cavity lengths) a factor of 3--10 better than the lowest previously reported.
- Research Organization:
- Xerox Palo Alto Research Center, Palo Alto, California 94304
- OSTI ID:
- 6224094
- Journal Information:
- J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 54:5; ISSN JAPIA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
420300* -- Engineering-- Lasers-- (-1989)
ALUMINIUM ARSENIDES
ALUMINIUM COMPOUNDS
ARSENIC COMPOUNDS
ARSENIDES
CHARGE CARRIERS
CHEMICAL COATING
CHEMICAL VAPOR DEPOSITION
CONFINEMENT
DATA
DEPOSITION
DIMENSIONS
EQUIPMENT
EXPERIMENTAL DATA
GALLIUM ARSENIDES
GALLIUM COMPOUNDS
HETEROJUNCTIONS
INFORMATION
JUNCTIONS
LASER CAVITIES
LASERS
MATHEMATICAL MODELS
NUMERICAL DATA
OPTICAL EQUIPMENT
OPTICAL PUMPING
ORGANIC COMPOUNDS
ORGANOMETALLIC COMPOUNDS
PNICTIDES
PUMPING
SCATTERING
SEMICONDUCTOR DEVICES
SEMICONDUCTOR JUNCTIONS
SEMICONDUCTOR LASERS
SURFACE COATING
THICKNESS
TRAPS
WAVEGUIDES