Abstract
We report on the extremely large nonresonant quadratic optical nonlinearity of the stilbazolium salt trans--(dimethylamino)-N-phenyl-4-stilbazolium hexafluorophosphate (DAPSH). The phenyl-pyridinium chromophores in DAPSH crystals grown from acetone solution pack with a highly aligned polar order, resulting in a very large birefringence, at and at . More importantly, this leads to an extremely large diagonal quadratic susceptibility with the nonlinear optical coefficient for second-harmonic generation reaching up to at fundamental wavelength, which presents a considerable improvement with respect to the presently best material trans--(dimethylamino)-N-methyl-4-stilbazolium tosyate (DAST) with at . The result is in agreement with the preferential packing of the chromophores and the previous studies demonstrating higher microscopic nonlinearity of the chromophores in DAPSH compared to that of DAST.
© 2008 Optical Society of America
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