Abstract
Tunable narrow-band optical filters over a wide spectral range are constructed. These use the efficient coupling of orthogonally polarized optical waves near the isotropic wavelength in graded-composition mixed crystals of CdS1−x Sex and Zn1−x Cdx S. In one crystal of CdS1−x Sex, x varied continuously between 0.04 and 0.29 and the central wavelength λi of the corresponding tunable filter from 5130 to 5700 Å. In one sample of Zn1−xCdx S, x varied from 0.41 at one end to 0.70 at the other and λi shifted from 4272 to 4584 Å. In both cases the transmission spectra were narrow peaks with peak transmission of 10–20% and widths at half-maximum of approximately 10 Å.
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