22 April 2008 Z-scan measurements of nonlinear refractive indices of NaT(XO4)2 T= Y, La, Gd, Lu and Bi, X= Mo, W, femtosecond laser crystals
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Abstract
The characterization of the coefficient of the nonlinear optical Kerr effect, the nonlinear refractive index (n2), of several femtosecond laser crystals with compositions derived by total or partial replacement of D2+ in DXO4, X = Mo or W, is presented. Tetragonal (space group I4) Na-based double tungstates NaT(WO4)2 (T = Y, La, Gd, Lu and Bi) and double molybdate NaY(MoO4)2, as well as the monoclinic (space group C2/c) Li3Gd3Ba2(MoO4)8 crystals, have been measured by the z-scan technique. All these crystals present structural local disorder, and among them the tetragonal ones exhibit significant n2 values, which should allow their efficient laser pulsed operation by Kerr-lens mode locking, especially NaBi(WO4)2, 68x10-16 cm2/W (for σ light), which is about twice than for the others. This feature is attributed to the high polarizability associated to the lone electron pair of Bi3+.
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Alberto García-Cortés, María-Dolores Serrano, Carlos Zaldo, Concepción Cascales, Gustav Strömqvist, Valdas Pasiskevicius, "Z-scan measurements of nonlinear refractive indices of NaT(XO4)2 T= Y, La, Gd, Lu and Bi, X= Mo, W, femtosecond laser crystals", Proc. SPIE 6998, Solid State Lasers and Amplifiers III, 69981N (22 April 2008); doi: 10.1117/12.781031; https://doi.org/10.1117/12.781031
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