Photonic-crystal surface emitting laser, laser array using the laser, and image forming apparatus using the laser array
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United States of America Patent
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May 14, 2013
Grant Date -
Mar 15, 2012
app pub date -
Sep 12, 2011
filing date -
Sep 14, 2010
priority date (Note) -
Expired
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Abstract
A laser structure is provided in which an influence caused by a concave-convex structure on laser characteristics is reduced when the Epitaxial Lateral Overgrowth (ELO) technique is applied to a photonic-crystal surface emitting laser. The laser structure includes a first layer, a second layer, a mask structure, a fourth layer, and a photonic crystal. An optical film thickness of the mask structure is not an integer multiple of a half of an oscillation wavelength λ, and reflectivity taken when laser light enters a multilayer structure including the first layer, the second layer, the mask structure, and the fourth layer from the fourth layer side is lower than reflectivity at an interface between the second layer and the first layer.
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