Achromatic tuner for birefringent optical filter

Details Achromatic tuner for birefringent optical filter Achromatic tuner for birefringent optical filter

1987-08-10

1988-09-20

Punter, William H.

350405, G02F 101

Patent

active

047721049

ABSTRACT:
An achromatic birefringent retardation plate has a quarter wave of linear optical birefringence over a wavelength range centered about a nominal wavelength. The plate includes a combination of two birefringent optical disks in adjacent positions along a light beam axis. Each disk has a linear optical birefringence with a fast axis. The two disks have thicknesses such that, at the nominal wavelength, they have their linear optical birefringence at n and m quarter waves, respectively of the nominal wavelength, where n is an odd integer greater than one and where m is an even integer greater than n. The fast axes of the linear birefrigences of the disks have rotational orientations about the light beam axis whereby the fast axis orientation of the other disk differs from that of one disk by ninety degrees, plus or minus one-half of the angle whose cosine is equal to the ratio of n to m.

REFERENCES:
patent: 4678287 (1987-07-01), Buhrer
Destriau et al., "Realisation d'un quart d'onde quasi acromatique par juxaposition de deux lames cristallines de meme nature", Jr. Phys. Radium, 2-1949, pp. 53-55.
Pancharatnam, S., "Achromatic Combinations of Birefringent Plates", Proc. Indian Academy of Sciences, 4-1955, pp. 130-136.
Koester, C. J., "Achromatic Combinations of Half-Wave Plates", Jr. Optical Soc. America, 4-1959, pp. 405-409.
Title, A. M., "Improvement of Birefringent Filters: 2: Achromatic Wave Plates", App. Optics, 1-1975, pp. 229-237.

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