| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a small collimator light source which emits polarized light having a small luminous flux diameter for a light sensor and has a simple structure for easy mounting. <P>SOLUTION: A collimator light source has at least a refractive index distribution type fiber and a coreless fiber which are fusion-connected in a ferrule. Light is injected from a light source connected adjacent to the refractive index distribution type fiber through a lens and emitted from adjacent to the coreless fiber. The ferrule is provided with a slit above an inclined end of the coreless fiber in the ferrule, and an optical element is arranged on an end of the coreless fiber. The inclined end of the coreless fiber has an inclination angle such that the end is inclined to the vertical plane of the optical axis at Brewster's angle Θb1. The propagation light is reflected at the inclined end. The optical element is arranged on the inclined end, having an emission surface with an inclination angle α to the optical axis of the fiber. The reflected light from the inclined end of the coreless fiber is emitted approximately vertically to the optical axis of the fiber. The small collimator light source thus emits the emission light having a small luminous flux diameter and a high extinction ratio. <P>COPYRIGHT: (C)2012,JPO&INPIT |
