10 research outputs found
Effect of Incoherent Illumination on Two-Beam Interaction of Light Waves in a Bismuth Titanate Crystal
Experimental investigations and theoretical analysis of the effect of external illumination on the
dynamics of formation of photorefractive reflection gratings in a (100)-cut bismuth titanate crystal showed that,
in the case of counter interaction of laser beams with a wavelength of 633 nm, incoherent green light may cause
a change in the sign of the two-beam gain
Broadband delay lines for acoustic surface waves
One of the main requirements imposed on delay lines for complex signals (see [1]) is low distortion of the shape of the signals; this allows the frequency transmission bandwidth to be treated as one of the principal parameters of such devices.In delay lines for the excitation of acoustic surface waves (ASW), the practice is mainly to use opposing-stub transducers which are characterized by a high conversion efficiency and extensive functional capabilities. However, their use at frequencies above 200 MHz is associated with significant technological difficulties
Dynamic Denisyuk holograms in cubic photorefractive crystals
Theoretical and experimental studies of the
interaction of two counterpropagating light waves on dynamic
reflection gratings formed in the Denisyuk scheme in cubic
photorefractive crystals due to the diffusion mechanism of the
charge transfer are considered. The results are presented
which demonstrate the possibility of using dynamic photorefractive Denisyuk holograms to design adaptive elements of
measuring systems based on optical and fiberoptic interferometers
Effect of Incoherent Illumination on Two-Beam Interaction of Light Waves in a Bismuth Titanate Crystal
Experimental investigations and theoretical analysis of the effect of external illumination on the
dynamics of formation of photorefractive reflection gratings in a (100)-cut bismuth titanate crystal showed that,
in the case of counter interaction of laser beams with a wavelength of 633 nm, incoherent green light may cause
a change in the sign of the two-beam gain