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Published on: November 30, 2012
Analysis of broad emission direction in a spiral-shaped microcavity laser
Myung-Woon Kim1, Kyu-Won Park, Chang-Hwan Yi
1Department of Physics, Sogang University, Seoul 121-742, South Korea.
Abstract:
Broad emission direction with two lobes is analyzed in a spiral-shaped microcavity laser. By pumping the boundary of the InGaAsP semiconductor laser with dc current injection, whispering-gallery-type modes emitting through a notch are obtained. By classifying the lasing modes into mode groups based on the equidistant mode spacing, it is shown that each mode group has its own emission direction with a narrow divergence angle and that a superposition of emission direction of dominant mode groups reproduces a far-field pattern of total intensity with two lobes, which is contrary to theoretical results.

