Z-scan measurements of nonlinear refractive indices of NaT(XO4)2 T= Y, La, Gd, Lu and Bi, X= Mo, W, femtosecond laser crystals

Alberto García-Cortés; María-Dolores Serrano; Carlos Zaldo; Concepción Cascales; Gustav Strömqvist; Valdas Pasiskevicius

doi:10.1117/12.781031

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

Alberto García-Cortés, María-Dolores Serrano, Carlos Zaldo, Concepción Cascales, Gustav Strömqvist, Valdas Pasiskevicius

Author Affiliations +

Proceedings Volume 6998, Solid State Lasers and Amplifiers III; 69981N (2008) https://doi.org/10.1117/12.781031
Event: SPIE Photonics Europe, 2008, Strasbourg, France

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 DXO_4, 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, and 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); https://doi.org/10.1117/12.781031

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