Dynamic holographic moiré patterns in photorefractive Bi12TiO20 and small-angle measurements.
A procedure for obtaining real-time holographic moirélike patterns and measuring small angles is proposed. Two rotated sinusoidal phase gratings are superposed, and the result represents a promising technique for making small-angle measurements in metrological applications. The experiments are performed with a diffusion-only recording mechanism in the photorefractive crystal Bi12TiO20 illuminated by lambda = 0.633 microm light from a He-Ne laser.
dos Santos
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Instituto de Física, Universidade Federal Fluminense, Avenida Gal Milton Tavares de Souza, s/n Gragoatá, Niterói 24020-005, Rio de Janeiro, Brazil. pams@if.uff.br
Nunes
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Corrêa
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