| 摘要 |
PURPOSE:To suppress reflecting noises completely, and to oscillate the titled simultaneously at a single longitudinal mode by constituting a composite resonator in which an optical fiber is arranged opposed to an semiconductor laser element and an end surface on the semiconductor laser element side of a clad section in the optical fiber is used as an external resonator end-surface. CONSTITUTION:Laser beams 28 in laser beams projected from a resonator end surface 27 for a semiconductor laser element 24 are coupled with a core section 30 for an optical fiber 29, laser besms 31 are reflected by a concave end surface on the semiconductor layer element 24 side of clad sections 32 in the optical fiber 29, and reflected beams 33 are projected to the semiconductor laser element 24 again. The position of the optical fiber 29 is adjusted finely so that the phases of beams in the semiconductor laser element 24 and reflected beams 33 coincide at that time. Accordingly, when beams are fed back to the semiconductor laser element 24, the semiconductor laser element 24 oscillates at a single longitudinal mode and the optical fiber 29 is used as a reflecting body when the conditions of phases are prepared, thus resulting in no reflecting beams, phases thereof are disarranged, from sections except the reflecting body, then completely suppressing reflecting noises. |
