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LiNaB4O7 crystals as a material for optically induced elastoopticity
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DOI：10.1021/cg0602461.png)
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Abstract
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During bicolor optical treatment by Nd: YAG laser radiation (lambda = 1060 nm) and its coherent second harmonic (lambda = 530 nm) of the LiNaB4O7 (LNTB) crystals ( space group Fdd2), a substantial increase in the elastooptic coefficient at lambda = 633 nm (up to 9 x 10(-13) m(2)/N) was revealed. The corresponding effect was maximal for the diagonal piezooptic POxxxx tensor component, where x is directed along the second-order crystallographic axes. The effect appears at temperatures below 80 K and achieves its maximal value at T = 4.2 K. The phenomenon appears after 2 min of optical treatment under laser power densities above 0.6 GW/cm(2) and is saturated after 5 min of the bicolor optical coherent treatment. The elastooptical effect decreases at least one order at temperatures below 50 K and 6 min after switching off the bicolor laser treatment.
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