Laser self-doubling in neodymium yttrium aluminum borate

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Abstract
The nonlinear effects of neodymium yttrium aluminum borate NdxY1−xAl3(BO3)4 (NYAB) crystal powder samples with different Nd3+ mole percentage are reported in this paper. The optimum X value for the growth of NYAB crystals with high optical homogeneity has been determined. The performance of laser self-frequency doubling from 1.06–0.53 μm has been realized, for the first time, in a 5×3×3 mm3 NYAB crystal. The Nd3+ ions in crystal show weak absorption at 0.53 μm. The threshold energy is measured to be less than 2 mJ; the output energy of green light at 0.53 μm is more than 5 mJ and the conversion efficiency is over 10%. The experiments show that the performance is improved if the optical path length is increased and the cavity design is improved. The refractive indices n0 and ne of the crystal have been measured by the prism method at different wavelengths. The phase-matching angles of Types I and II have been obtained by solving equations for the phase-matching angles. The results are in good agreement with the experimental values. The nonlinear coefficient d11 of the NYAB crystal has been measured to be 4×10−9 esu.

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