A bulk photovoltaic effect has been observed in a ferroelectric polymer, polyvinylidene fluoride. Permanent photocurrents and photovoltages are generated by incident light in the visible region without application of any external electric field. The results are interpreted according to theory developed for similar effects found in ferroelectric and pyroelectric single crystals and ceramics.

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Relative efficiency of 2 0 0Hg7 9Br, Hg7 9Br, and HgBr electric discharge lasers Appl. Phys. Lett. 43, 622 (1983); 10.1063/1.94464 A kinetic model of the sustained discharge HgBr laser

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The effects of temperature and longitudinal stress on the phase delay of reference signals in a fiber-optic link are discussed. A feedback system that uses a fiber-optic phase modulator is used to compensate for the phase fluctuations of a reference signal in the link. The phase deviations of a 50-MHz reference frequency that are caused by temperature variations of the link is reduced by more than 95% on optimization of the correction system. The advantages of this technique are that the fiber-optic phase modulator has a greater stability compared with the electronic phase modulators, and signal conversions from electric to optic and optic to electric are avoided.