Infrared achromatic retarder

Details Infrared achromatic retarder Infrared achromatic retarder

1989-06-14

1990-10-09

Bovernick, Rodney B.

350406, 350407, 350 11, G02B 530

Patent

active

049616340

ABSTRACT:
An infrared achromatic waveplate structure having a cadmium sulfide (CdS) plate and a cadmium selenide (CdSe) plate aligned with each other so that the fast axis of the plates are perpendicular to each other, this structure provides a desired retardance of a first orthogonal polarization component with respect to a second orthogonal polarization component of an incident light beam. The thickness of the plates are in a ratio between 0.8:1 and 0.9:1 (CdSe:CdS), an achromatic response with a substantially constant retardance is provided in a wavelength range from 3 to 11 microns. A desired amount of retardance is available by adjusting the thickness of the two plates as long as the ratio of the thicknesses is maintained within the recited value. In particular a quarter wave net retardance of an incident light beam operating between 3 and 11 microns is provided when the cadmium sulfide plate is 1.25 millimeters and the cadmium selenide plate is 1.0666 millimeters.

REFERENCES:
patent: 4229073 (1980-10-01), Lotspeich
patent: 4500178 (1985-02-01), Yeh
patent: 4548479 (1985-10-01), Yeh
patent: 4772104 (1988-09-01), Buhrer

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