Patent ID: 9091747
Filing Date: 2015-07-28
Classification: G01B,G01P,G01S,G02B,G06F

Abstract:
1. A self-mixing interference device comprising: a substrate with an integrated optical waveguide structure; a semiconductor laser source, arranged on a surface of said substrate and emitting laser radiation towards said surface; and a photodetector arranged to detect intensity variations of said laser radiation, wherein said waveguide structure is optically connected to said laser source and is configured to guide said laser radiation emitted by said laser source to an out-coupling area at said surface of said substrate for output of said laser radiation from said surface to a target object and to guide a portion of said laser radiation scattered back from the target object outside of said substrate to re-enter the laser source, wherein said waveguide structure includes a coupling structure located in the substrate to collimate said laser radiation and couple said collimated laser radiation at an output position of said surface out of said waveguide structure for output of said collimated laser radiation as parallel beams, wherein the coupling structure comprises at least one concave mirror and an optical deflecting element, the at least one concave mirror collimating the laser radiation and reflecting the collimated laser radiation toward said optical deflecting element for deflecting the laser radiation as it passes through the optical deflecting element for output of the collimated laser radiation from the optical deflecting element toward the target object as the parallel beams, and wherein the optical deflecting element includes a portion having a saw-tooth shape for receiving the collimated laser radiation from the at least one concave mirror and changing a direction of the collimated laser radiation for output of the collimated laser radiation from the optical deflecting element toward the target object as the parallel beams.