Fabrication of (K, Na)NbO 3 glass–ceramics and crystal line patterning on glass surface

Abstract

Crystallization behavior of (30− x)K 2O– xNa 2O–25Nb 2O 5–45SiO 2 (KNNS; x = 0, 5, 10, 20 and 30) (mol%) glasses was clarified and perovskite-type nonlinear optical (K, Na)NbO 3 (KNN) crystals were synthesized by using a conventional glass–ceramics method. It was found that Na 2O amounts over around x = 10 mol% were necessary to form perovskite-type KNN crystals showing second-harmonic generations. The substitution of K + and Na + ions was confirmed from X-ray diffraction (XRD) analysis. A continues-wave of Yb:YVO 4 fiber laser (wavelength: 1080 nm) was irradiated onto CuO doped KNNS; x = 10 (Cu–KNNS) surface. The absorption coefficient of this Cu–KNNS glass was determined to be α = 5.0 cm −1. Perovskite-type KNN crystals were patterned in the condition of the laser power of >1.20 W and the laser scanning speed of S = 7 μm/s, and their structure was determined by Raman scattering spectra and XRD analysis.