Abstract
We report the operation of two-dimensional distributed-feedback (DFB) lasers in which periodic thickness variations exist in two orthogonal directions in the plane of the film. By using photoresist and chemical etching, two-dimensional gratings with periods of 0.635 and 4.34 μm are formed on fused silica substrates. For the gain medium, a polyurethane film doped with rhodamine 6G is used. Emission characteristics and potential applications of two-dimensional DFB lasers are discussed.
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