Determination of photoelastic properties of silicon crystals in visible range
Annotatsiya
As is well known, the acousto-optic interaction in absolutely transparent crystals is lacking. In this connection the greatest interest are presented the acousto-optic investigations in the optical range, in which the crystals are not transparent. In order to carry out the similar experiments, it is necessary to use a buffer crystal with a small coefficient of light absorption at the applied wavelength. In the present work the effective photoelastic constant of a silicon crystal was determined by the Bragg light diffraction method at a wavelength 632.8 nm. A gallium phosphide crystal sample was used as a buffer crystal because it is transparent in the visible range of the spectrum and has good acoustooptical quality. The research results have shown the possibility of determination of photoelastic properties of silicon crystals by the method of Bragg light diffraction in the visible range of the light. In such experiments, the intensity of diffracted light can be obtained by an order of magnitude greater than in crystals transparent in the visible region of the light, such as lithium niobate, paratellurite, or lead molybdate.