Investigations of NCPM second harmonic generation and self frequency doubling in Gd1−x−yRxNdyCa4O(BO3)3 (R=Sc or Lu) crystals

Abstract Pure and Nd 3+ doped single crystals of Gd 1− x R x Ca 4 O(BO 3 ) 3 (R 3+ = Sc 3+ or Lu 3+ ) with large size and good quality have been grown by the Czochralski pulling technique. By changing the compositional parameter x of Gd 1− x R x Ca 4 O(BO 3 ) 3 crystals, their optical birefringence can be controlled in order to achieve non-critical phase matching (NCPM) in the ranges of 790–824 nm along Y -axis and 920–963 nm along Z -axis, during second harmonic generations. Nonlinear optical properties of these new biaxial borate crystals are reported. Preliminary investigations of self frequency doubling in NCPM condition in Gd 1− x − y R x Nd y Ca 4 O(BO 3 ) 3 crystals have been carried out.