Birefringent filter design

Details Birefringent filter design Birefringent filter design

1991-04-08

1991-11-05

Davie, James W.

Optical: systems and elements

Polarization without modulation

By relatively adjustable superimposed or in series polarizers

372105, G02B 2728

Patent

active

050626949

ABSTRACT:
A birefringent filter is provided for tuning the wavelength of a broad band emission laser. The filter comprises thin plates of a birefringent material having thicknesses which are non-unity, integral multiples of the difference between the thicknesses of the two thinnest plates. The resulting wavelength selectivity is substantially equivalent to the wavelength selectivity of a conventional filter which has a thinnest plate having a thickness equal to this thickness difference. The present invention obtains an acceptable tuning of the wavelength while avoiding a decrease in optical quality associated with conventional filters wherein the respective plate thicknesses are integral multiples of the thinnest plate.

REFERENCES:
patent: 3872402 (1975-03-01), Sanchez
patent: 4269481 (1981-05-01), Yeh et al.
patent: 4569053 (1986-02-01), Roullard, III et al.
patent: 4678287 (1987-07-01), Buhser
patent: 4698816 (1987-10-01), Chun
patent: 4914664 (1990-04-01), Woodward
patent: 4987567 (1991-01-01), Buhser

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