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 β-barium borate (~2 pm/V), and its angular sensitivity [δ(Δk)/δθ] is somewhat smaller.
© 1995 Optical Society of America
H. O. Marcy, M. J. Rosker, L. F. Warren, P. H. Cunningham, C. A. Thomas, L. A. DeLoach, S. P. Velsko, C. A. Ebbers, J.-H. Liao, and M. G. Kanatzidis, "L-Histidine tetrafluoroborate: a solution-grown semiorganic crystal for nonlinear frequency conversion," Opt. Lett. 20, 252-254 (1995)