| 摘要 |
The method involves using a Pockel crystal (12) into which first and second polarised light beam (4,6) are coupled. The first and second light beams (4a), which emerge from the crystal are, redirected by a multiple inner total reflection. The light beams are phase shifted with respect to each other about an odd multiple of lambda/4 by an inner total reflection of at least one emerged light beam. The beams are then coupled again into the Pockel crystal. At least a triple inner total reflection of at least one emerged light beam is carried out for the phase shift.
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