| 摘要 |
<p>A method for accurately aligning an optical fibre with a light source comprises firstly approximately aligning the axis of the fibre with the source (eg. a laser) and locating two prismatic elements between the end of the fibre and the source. One or both of the prismatic elements is then moved to focus the image of the light source on to the end of the fibre and secured in position.</p><p>The method can be described as an «optical lever» as the movement of one of the prismatic elements causes a much smaller movement of the image and the method is thus very accurate.</p><p>The prismatic elements can be any transparent members which produce an output beam which is angularly displaced from the input beam such as conventional prisms, gratings, diffused lenses or weak decentred lenses. Preferably they are cylindrical transparent rods with one end of each arranged at an acute angle to its axis.</p> |
