| 摘要 |
Methods and apparatus for passing laser light into an optical fiber having a light input face thereacross, focus the laser light onto a front focus plane of focusing means for forming a spatial spectrum of light distribution in which noise frequencies are spatially distributed about a central spot of light. The position of the light input face of the fiber is coarsely adjusted relative to the focus plane for capturing with the fiber the central spot of light to the exclusion of distributed noise frequencies. The central spot of light is finely adjusted in position on the light input face of the fiber by tilting the focusing means and the light input face of the fiber until a maximum of light energy from the central spot is transmitted through the input face and the fiber. The latter tilting preferably is effected relative to a rear focal plane of the focusing means or about a pivot in such rear focal plane.
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