No abstract

The crystal structure, refractive indices, and phase-matching conditions for a new nonlinear optical material, L-histidine tetrafluoroborate (HFB), are reported. HFB grows readily, displays favorable mechanical characteristics, and has adequate birefringence to permit phase-matched parametric processes over much of its transparency range (250 nm to 1300 nm). The phase-matching loci and angular sensitivity for second-harmonic generation of 1064-nm light in single crystals of HFB were measured. The effective nonlinearity for HFB is comparable with that of beta-barium borate (~2 pm/V), and its angular sensitivity [delta(Deltak)/deltatheta] is somewhat smaller.

No abstract

C6H16N402+.2[AsO2(OH)2] -, M r = 458.09, orthorhombic, P21212~, a = 9.787 (2), b = 22.024 (2), c = 7.134 (3) A, V= 1380.6 A 3, Z = 4, D x = 2.20 g cm -3, 2(Mo K~t) = 0.71073 A,/~ = 48.87 cm -1, F(000) = 920, T= 296 K, R = 0.021 for 2563 [F 2 > tr(F2)] of 2732 total unique data. L-Arginine 2÷ cations and [AsO2(OH)2]-anions are connected by a network of hydrogen bonds. Experimental. (+)-L-Argine diarsenate was investigated for its second-harmonic-generating properties, C-N-C-C-, 2 O--OH

No abstract