Abstract
The linear absorption bandgap in the ultraviolet and the nonlinear index n 2 in near infrared were systematically measured in undoped and Yb3+-doped top-seeded solution-grown monoclinic double-tungstate KRE(WO4)2 (RE=Gd, Y, Yb, Lu) crystals. Anisotropic n 2 nonlinear indices have been determined for E‖N m and E‖N p polarizations with the maximum nonlinear index n 2 observed for the light polarized E‖N m. Moreover, the value of the nonlinear response of particular crystals in this family is proportional to the ionic radius of the RE3+ ion.
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Thilmann, N., Strömqvist, G., Pujol, M.C. et al. Nonlinear refractive indices in Yb3+-doped and undoped monoclinic double tungstates KRE(WO4)2 where RE=Gd, Y, Yb, Lu. Appl. Phys. B 96, 385–392 (2009). https://doi.org/10.1007/s00340-009-3487-y
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DOI: https://doi.org/10.1007/s00340-009-3487-y