Nonlinear optical borate crystals of Gd<sub>1−x</sub>SC<sub>x</sub>Ca<sub>4</sub>O(BO<sub>3</sub>)<sub>3</sub> and Gd<sub>1−x</sub>Lu<sub>x</sub>Ca<sub>4</sub>O(BO<sub>3</sub>)<sub>3</sub> have been grown and characterized. By changing the composition of these crystals, their optical birefringence can be controlled to obtain second-harmonic generations (SHG) in the ranges of 790-824 nm along the Y axis and 920-963 nm along the Z axis through noncritical phase matching (NCPM). The refractive indices of grown crystals were measured with a minimum-deviation technique. The experimental results of NCPM conditions for SHG are in good agreement with the theoretical predictions.
© 2006 Optical Society of America
Original Manuscript: January 27, 2006
Revised Manuscript: April 12, 2006
Manuscript Accepted: April 14, 2006
Lucian Gheorghe, Voicu Lupei, Pascal Loiseau, Gerard Aka, and Takunori Taira, "Second-harmonic generations of blue light in nonlinear optical crystals of Gd1−xLuxCa4O(BO3)3 and Gd1−xScxCa4O(BO3)3 through noncritical phase matching," J. Opt. Soc. Am. B 23, 1630-1634 (2006)