| 摘要 |
PURPOSE:To generate a laser beam of linear polarization stably without performing polarization control especially by a comparatively simple structure, by making the laser beam go and return between first and second optical fiber mirror sections. CONSTITUTION:A first optical fiber mirror section FM1 has a wavelengthdependent optical fiber coupler C1, and excitation light is caused to pass without being changed, but the light of the wavelength of a laser beam is equally branched half by half and emitted. And each one end corn the same side of a pair of optical fibers constituting this wavelength-dependent optical fiber coupler C1 is connected to each other into a loop through the medium of an optical fiber F1. On the other hand, a second optical fiber mirror section FM has a polarization-dependent optical fiber coupler C2, and only the light of a specific polarization angle of a laser beam is equally branched half by half and emitted. And each one end on the same side of a pair of optical fibers constituting this polarization-dependent fiber coupler C2 is connected to each other into a loop through the medium of an optical fiber F2. |
