Second-Harmonic Generation of Ferroelectric Potassium Lithium Niobate Crystals

概要

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The second-harmonic generation (SHG) properties of a potassium lithium niobate (KLN) crystal with the size of $8\times 20\times 43$ mm3 were studied in detail. The KLN crystal was grown from a melt consisting of 32 mol% K2O, 24 mol% Li2O and 44 mol% Nb2O5 (denoted as the melt $32:24:44$) by the top-seeded solution growth (TSSG) method. The ferroelectricity of the KLN crystal was revealed by the marked dielectric anomaly at the Curie temperature. The full-widths at half maximum (FWHMs) of the wavelength- and temperature-tuning curves of a 4-mm-long KLN crystal sample were found to be 0.6 nm and 2°C, respectively. The SHG conversion efficiency of this crystal was studied and estimated to be 0.03%/W for an input power of 748 mW@. The CW tunable blue laser covering the range of 431.1–437.6 nm was achieved by tuning the crystal temperature in the range of 24–80°C. The crystal studied in this paper is more inhomogeneous and has lower SHG efficiency than the KLN crystal grown from the melt $31:26:43$, which has higher Li2O content.
2001-07-15