Anisotropy of nonlinear optical properties in monoclinic crystal TmCa4O(BO3)3

New nonlinear optical (NLO) crystals TmCa4O(BO3)(3) (TmCOB) were grown by the Czochralski pulling method, and the anisotropy of second-harmonic-generation (SHG) properties were characterized. Based on the ratio of the peaks of the 2 omega. signals produced by TmCOB and that of KTP crystal samples at the low fundamental energy, the NLO tensor coefficients d(12), d(32), d(31) and d(13) were determined and found to be 0.24, 1.70, -0.55 and -0.32 pm/V, respectively. At 1064 nm, the phase-matching (PM) curves and the effective NLO coefficients (d(eff)) in spatial distribution were evaluated. Efficient SHG was realized on a (32.5 degrees, 180 degrees)-cut TmCOB sample (4 x 4 x 11.8 mm(3)) in principal plane, by using a 1064 nm Nd:YAG pico-second laser, where the highest conversion efficiency of the single-pass light reached up to 51%, while for a (112.5 degrees, 35.9 degrees)-cut TmCOB sample (4 x 4 x 8 mm(3)) in spatial PM direction, the single-pass light reached 58%. Meanwhile, the angular noncritical phase matching (A-NCPM) wavelengths along the Y and Z principal axes were calculated and measured, and the limit of type-I PM wavelength of TmCOB was found to be 716 nm. (C)2014 Optical Society of America