| 摘要 |
The coupling device comprises a transparent block (1a) in the shape of a semi-ellipse at the foci of which the end portions (2a and 4a) of two lightguides terminate. The light beam (6) emerging from the lightguide (2a) is reflected and converted into a beam (8) converging on the end of the end portion (4a). A slit (10) enables a liquid-crystal attenuating device (21), connected to an alternating voltage source (V) to be inserted. <IMAGE>
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