Abstract
Quartz crystal has long been used for its birefringence, optical activity, hardness that supports fabrication, and chemical inertness that allows optical surfaces to be stable in all but the most corrosive environments. Historically, quartz like Iceland spar has been found in ground deposits. Sections suitable for optical use representing only a small fraction of the miner's product are isolated through long hours of raw material inspection and the loss of partially finished optics in the fabrication shop.
© 1982 Optical Society of America
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