| 摘要 |
PURPOSE:To fully prevent light from returning from an edge side to a light emission section and to fully restrain FP mode oscillation by forming a bending guide active layer which guides light following a linear active layer to a direction which is different from that on an extension axis of the active layer. CONSTITUTION:A linear active layer 14 is formed vertically to a cleavage edge side 21 which becomes a take-out surface of light, and bent at an active layer 15 of a bending guide following the active layer 14 at a radius of curvature R which allows to guide most of light emitted at the linear active layer 14. In a part wherein light is absorbed while being guided, the longer the bending guide active layer 15 is, the more it effects in a state that non-excitation or reverse-bias is applied. In this case, bending loss is extremely little at the radius of curvature R of 3mm or more, and most light is guided and escaped. Effect to restrain FP mode oscillation becomes larger by forming an AR film to the edge side 21 for taking out of light. |
