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Photonic Microstructures as Laser Mirrors

Research Area: Nanophotonics Year: 1998
Type of Publication: Article Keywords: photonic microstructures, semiconductor lasers, Bragg mirrors, photonic bandgap, low threshold
Authors: Krauss, Thomas; Painter, Oskar; Scherer, Axel; Roberts, J. S.; Rue, R. M. De La
Journal: Optical Engineering Volume: 37
Number: 4 Pages: 1143-1148
Month: April
Abstract:
Deeply etched 1-D third-order Bragg reflectors have been used as mirrors for broad-area semiconductor lasers operating at 975-nm wavelength. From a threshold and efficiency analysis, we determine the mirror reflectivity to be approximately 95%. The design of the GaAs-based laser structure features three InGaAs quantum wells placed close (0.5 µm) to the surface in order to reduce the required etch depth and facilitate high-quality etching. Despite the shallow design and the proximity of the guided mode to the metal contact, the threshold current density (Jth = 220 A/cm2 for infinite cavity length) and internal loss (alpha_i = 9 ± 1 cm – 1) are very low.
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