FIELD: optics.
SUBSTANCE: invention relates to optical technique. Optical device for increasing the length of the optical path of incident radiation comprises at least one electroactive optical cell configured to repeatedly transmit optical radiation in mutually inverse directions, and a selective polarization structure configured to shift the image. Said structure comprises at least one semitransparent mirror, at least one quarter-wave plate (QWP) and at least one polarization beam splitter (PBS).
EFFECT: technical result consists in enabling increase in the optical path of the incident optical radiation.
12 cl, 8 dwg
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