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We experimentally demonstrated angular selectivity in a nondestructive readout of a photochromic protein bacteriorhodopsin (bR). bR is a photochromic material which has many unique properties. Especially, its high spatial resolutional recording ability is suitable for holographic applications. From the viewpoint of latching, it is desirable to preserve a hologram after readout. The experimental result shows a weak angular selectivity in a volume hologram on bR.

SYNOPSISFibers of isotactic polypropylene were obtained by high-temperature drawing, adopting a two-stage process. Very high drawing degrees were achieved, more than 40. The physical behavior was analyzed by determining the dynamic-mechanical relaxation spectra in monoaxial stretching. The results obtained show that the elastic modulus reaches a saturation value a t deformation degrees of about 20, well below the drawability upper limit, indicating that above 20 any further drawing does not affect the structure. Moreover the 0 transition appears weak or absent in the drawn samples, while the 01 transition is still readily detectable. Both effects agree with Peterlin's model of drawing and with the fiber structure.

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