High-differential-quantum-efficiency, long-wavelength vertical-cavity lasers using five-stage bipolar-cascade active regions

Journal Article · Mon May 23 00:00:00 EDT 2005 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.1931060· OSTI ID:20702389

Koda, R; Wang, C S; Lofgreen, D D; Coldren, L A ^[1]

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1. Department of Electrical and Computer Engineering, University of California, Santa Barbara, California 93106 (United States)

We present five-stage bipolar-cascade vertical-cavity surface-emitting lasers emitting at 1.54 {mu}m grown monolithically on an InP substrate by molecular beam epitaxy. A differential quantum efficiency of 120%, was measured with a threshold current density of 767 A/cm{sup 2} and voltage of 4.49 V, only 0.5 V larger than 5x0.8 V, the aggregate photon energy. Diffraction loss study on deeply etched pillars indicates that diffraction loss is a major loss mechanism for such multiple-active region devices larger than 20 {mu}m. We also report a model on the relationship of diffraction loss to the number of active stages.

• OSTI ID: 20702389
• Journal Information: Applied Physics Letters, Vol. 86, Issue 21; Other Information: DOI: 10.1063/1.1931060; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CAVITY RESONATORS
CRYSTAL GROWTH
ELECTRIC POTENTIAL
INDIUM PHOSPHIDES
LASER CAVITIES
LASERS
MOLECULAR BEAM EPITAXY
PHOTONS
QUANTUM EFFICIENCY
SEMICONDUCTOR MATERIALS
SUBSTRATES
THRESHOLD CURRENT
WAVELENGTHS