Liu, Pengxiang Cascaded difference frequency generation in organic crystal 4'-dimethylamino-N-methyl-4-stilbazolium tosylate. [electronic resource] - Optics letters Oct 2019 - 4965-4968 p. digital Publication Type: Journal Article ISSN: 1539-4794 Standard No.: 10.1364/OL.44.004965 doi