An organic salt 4-(4-dimethylaminostyryl)-1-methylpyridinium tosylate (DAST) crystal has extremely large optical nonlinearities and is a promising material for optical switching and frequency conversion. DAST crystal grown in b direction with sufficient length is necessary to utilize the largest electro-optic coefficient r{sub}11 and the crystal should take waveguide structure in order to fabricate highly efficient optical devices. In this report, crystal growth from a seed crystal was performed by temperature lowering method and the crystal with ridge structure parallel to b axis was grown successfully by using a substrate with a grooved structure and applying the growth behavior of the crystal.
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