Current-controlled phase retardation plate.
A plate of fused quartz mounted in the jaws of a magnetic clamp serves as a current-controlled phase retardation plate. The current to the clamp controls the stress on the quartz plate, and hence the amount of stress-induced birefringence. The device described here can be used in a dc mode as a fixed phase retardation plate or in an ac mode as a polarization modulator at frequencies up to several hundred hertz. This device offers several advantages over other polarization modulators available.
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Zak
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Chang
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Hadeishi