| 摘要 |
<p>In a fiber laser, a stable laser oscillation can be easily obtained. The fiber laser (1) comprises: an optical amplification portion (10) having a first end (10a) and a second end (10b), emitting spontaneous emission light from the first end (10a) upon receiving excitation light, and emitting stimulated emission light from the first end (10a) upon receiving spontaneous emission light at the second end (10b); and a light passing portion (PM fibers (22a, 22b, 22c, 22d, 22e, 22f), single mode fiber (24)) which connects between the first end (10a) and the second end (10b) and through which the spontaneous emission light and the stimulated emission light pass. Further, the light passing portion includes the PM fibers (polarization plane maintaining portions) (22a, 22b, 22c, 22d, 22e, 22f) in which the change of the polarization plane of passing light is small and the single mode fiber (polarization plane changing portion) (24) in which the change of the polarization plane of passing light is large.</p> |
