Four hundred-nanometer blue-violet light production by type-I noncritical phase-matching second-harmonic generation in Gd_(1-x)R_xCa_4O(BO_3)_3 (R = Lu, Sc): Crystal growth and nonlinear characterization

摘要

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