Lithium niobate continues to be at the forefront of research in terahertz (THz) generation due to its exceptional nonlinear optical properties. Optical rectification, a second-order nonlinear process, ...
Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, Vol. 299, No. 1457 (Jun. 14, 1967), pp. 238-263 (26 pages) Ammonium dihydrogen phosphate (NH4H2PO4), potassium ...