| 摘要 |
PROBLEM TO BE SOLVED: To provide a fiber laser hindering laser oscillation at an undesired wavelength. SOLUTION: An multi-mode fiber 51 in the fiber laser 40 is placed between a diode laser 49 used to activate an active medium of the fiber laser 40 and the fiber laser 40 used for an optical source. The multi-mode fiber part 51 reduces dramatically the intensity of the fiber laser beam made incident onto the diode laser 49 thereby increasing the reliability of the fiber laser 40. Furthermore, the multi-mode fiber part 51 reduces considerably an undesired wavelength so that the laser oscillation of the fiber laser 40 reaches its threshold value. When the fiber laser 40 is used for a source of a pump light in an FAMP, an adverse effect of multi-path interference MPI can be reduced. |
