Optical materials for near infrared Wollaston prisms

Astronomy and Astrophysics – Astronomy

Scientific paper

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Instrumentation: Miscellaneous, Instrumentation: Polarimeters

Scientific paper

The optical characteristics of birefringent materials transmitting in the near IR (0.9-2.5 microns) are analyzed. Wollaston prisms with large beam separation and virtually free from lateral chromatism -- e.g. with fields of view $>1$ arcmin and image elongation ! 3 cm^{-1}) beyond 2.25 microns. The absorption does not decrease significantly when the crystals is cooled, CaCO_3 should not be therefore used in instruments working beyond 2.0 microns.

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