New nonlinear Gd_(1-x)R_xCa_4O(BO_3)_3 (R = Lu, Sc) crystals for 400nm blue-violet light generation by type-I noncritical phase-matching frequency doubling processes

摘要

Single crystals of Gd_(1-x)R_xCa_4O(BO_3)_3 (R~(3+) = Sc~(3+) or Lu~(3+)) with large size and good quality have been grown by Czochralski method. The optical birefringence of Gd_(1-x)R_xCa_4O(BO_3)_3 and Gd_(1-x)R_xCa_4O(BO_3)_3 crystals can be controlled by changing the compositional parameter x. The chemical compositions of the grown crystals were determined and X-ray diffraction measurements have been carried out to characterize the structural changes with compositional parameter x. According to our assumptions, the obtained results demonstrate that two of the grown crystals convert the near-infrared radiation of 800nm into blue-violet light (400nm) by type-I noncritical phase-matching (NCPM) second-harmonic generation (SHG) processes along Y axis.