L-HISTIDINE TETRAFLUOROBORATE - A SOLUTION-GROWN SEMIORGANIC CRYSTAL FOR NONLINEAR FREQUENCY-CONVERSION

The crystal structure, refractive indices, and phase-matching conditions for st 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 (similar to 2 pm/V), and its angular sensitivity [delta(Delta k)/delta theta] is somewhat smaller.