Abstract
Large sized and optical quality GdCa4O(BO3)3 (GdCOB)crystal with calcium partiallysubstituted by strontium (Sr) ions was grown for the first time.The x-ray powderdiffraction shows that the Sr ion has an effect on the cell parametersof the GdCOBcrystal. Second-harmonic generation (SHG) experiments were performedon theSr:GdCOB and GdCOB crystals along the spatial phase-matching direction. Theresults show that the cw green laser output power is 1.04 Wwhen the laser diodepump power is 10 W in the Nd:YVO4/Sr:GdCOB intracavity laser. Considering theslope efficiency of Nd:YVO4 and the fundamental laser in cavity,the intracavity SHGconversion efficiency of the GdCOB crystal is 21% while it is 24% forthe Sr:GdCOBcrystal, the SHG conversion efficiency is improved by 14%. The effectof the Sr ionson the nonlinearity of the GdCOB crystal is also discussed by using theanion group theory. PACS: 42. 65. Ky, 78. 20. -e, 78. 55. Hx
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