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Light-induced birefringence change plotted as a function of irradiation time by using an intensity of at , for the 5 mol % -doped congruent LN crystal. The green beam is switched on at , off at , on at , and so on.
Saturation value and photoconductivity vs concentration for congruent LN crystals, measured at a 532 nm beam intensity of .
(a) Measured birefringence transients for the 4 mol % -doped congruent LN crystal. (b) Photorefraction transient, obtained as the difference between the two transients of (a), together with the exponential fit (full curve).
Change of birefringence due to the thermal effect plotted as a function of the green-beam intensity. The full curve represents a fit with a quadratic function.
Photorefractive parameters of pure and doped LN crystals of congruent and stoichiometric composition for a light intensity of .
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