Compositions – Light transmission modifying compositions – Producing polarized light
Patent
1996-03-05
1999-08-31
Tucker, Philip
Compositions
Light transmission modifying compositions
Producing polarized light
252584, 423421, 359485, 359494, F21V 914, G02B 530, C01D 700
Patent
active
059450371
ABSTRACT:
Several crystals have been identified which can be grown using standard single crystals growth techniques and which have a high birefringence. The identified crystals include Li.sub.2 CO.sub.3, LiNaCO.sub.3, LiKCO.sub.3, LiRbCO.sub.3 and LiCsCO.sub.3. The condition of high birefringence leads to their application as optical polarizer materials. In one embodiment of the invention, the crystal has the chemical formula LiK.sub.(1-w-x-y) Na.sub.(1-w-x-z) Rb.sub.(1-w-y-z) Cs.sub.(1-x-y-z) CO.sub.3, where w+x+y+z=1. In another embodiment, the crystalline material may be selected from a an alkali metal carbonate and a double salt of alkali metal carbonates, where the polarizer has a Wollaston configuration, a Glan-Thompson configuration or a Glan-Taylor configuration. A method of making an LiNaCO.sub.3 optical polarizer is described. A similar method is shown for making an LiKCO.sub.3 optical polarizer.
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Christmann et al., Chemical Abstracts 90:64852, Abstract of Rev. Chim. Miner., vol. 15, No. 4, pp. 312-317, (1978).
The Regents of the University of California
Tucker Philip
Wooldridge John P.
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