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AssigneesJapan Science and Technology Agency, Rohm Co., Ltd.
InventorsSusumu Noda, Yoshitaka Kurosaka, Kyosuke Sakai, Eiji Miyai, Dai Ohnishi, Wataru Kunishi
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A laser capable of emitting multiple laser beams is provided. A two-dimensional photonic crystal laser according to the present invention has a laminated structure including an active layer, a first photonic crystal layer having a periodic distribution of refractive index with a first period, and a second photonic crystal layer having a periodic distribution of refractive index with a second period that differs from the first period. This two-dimensional photonic crystal laser can emit a main beam traveling in a direction perpendicular to the two-dimensional photonic crystals and side beams each traveling in a direction inclined with respect to the main beam. These beams can be used, for example, in a recording/reproducing device by means of an optical disk, the main beam being used for recording/reproducing information and the side beams for following up the track.
A photonic crystal laser comprising:
Dependencies are inferred from the claim text.