The diffraction efficiency of the volume grating written and read out in Ce:KNSBN crystal by using orthogonally
polarized light beams (solid state laser with 532nm) is experimentally studied, which exhibits a loop versus the variation
of the fringe modulation. And compare with the extraordinary polarization, the diffraction efficiency is improved 20%
with mutually orthogonal polarized wave while the angle between the incident plane and the polarization direction of the
pump beam equals to 30°. The properties of two-wave coupling edge-enhancement under different intensity ratio of the
reference beam to the object beam are experimentally investigated by using the setup of the Fourier-transform hologram
real-time writing and reading with Ce:KNSBN crystal as the recording medium. It is found that the effect of the image
edge-enhancement strongly influenced by the intensity ratio of the reference beam to the object beam. There is no
edge-enhancement with the intensity ratio of the reference beam to the object beam of 50:1, the high frequency
component in the object beam is enhanced greatly and the low frequency component is obviously weakened with the
intensity ratio of the reference beam to the object beam of 3:1. Along with the decreasing of the intensity ratio of the
reference beam to the object beam, the effect of the image edge-enhancement is still obvious even when the intensity
ratio reverses.
In this experiment, the dynamic two-wave coupling properties of extraordinarily polarized He-Ne 632.8nm laser beam in a Ce:KNSBN crystal were studied with a real-time data-acquisition system. The transmitted pump beam intensity Ip' and the transmitted signal beam intensity Is' were recorded as a function of time. While the incident beams of two-wave coupling are both with extraordinary polarization, a great fanning will generate and it would affect the two-wave coupling dynamic properties. The dynamic evolution of two-wave coupling had great differences while the total incident beam intensity and the incident beam intensity ratio were different. The coupled-wave equations were modified according to the beam-fanning threshold phenomena and the experimental data. The theoretical calculation results obtained from the modified coupled-wave equations were agree with the experimental data very well.
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