| 摘要 |
PURPOSE:To realize a mesurement of the multiple refractive ibdex without measuring the diameter of the filament previously, by irradiating the laser beams with the polarizing faces parallel and vertical to the filament and then observing the positions of three of more fringes of the interference fringes and the number of fringes among these three positions. CONSTITUTION:The laser beam the polarized face of which is parallel to the filament 2 is irradiated to the filament 2 from the laser beam source 1, and then the positions of three or more fringes of the interference fringes caused by the reflected light and the transmitted light are observed along with the number of fringes among these three positins. And the refractive index n (parallel) is obtained from the prescribed equation. Then the laser beam the polarized face of which is vertical to the filament 2 is irradiated to obtan the refractive index n (vertical) in the same way as above. Thus the multiple refractive index DELTAn=n(parallel)-n(vertical) is calculated from the values of both refractive indexes. In such way, the multiple refractive index can be measured in a simple way and with a high accuracy without mearsuring the diameter of the filament previously. |
