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Oxides of xZnO­(100 1 x)GeO2 (x = 0, 25, 50, 66.7, 75 and 100mol%) were produced mainly by sol­gel method. Their XRD patterns show that there exist hexagonal ZnO (wurtzite), rhombohedral Zn2GeO4, and hexagonal GeO2 (¡-quartz type). All the oxides showed second harmonic generation (SHG) green emission peaking around 532 nm with luminance of about 0.05­ 1.20 cd·m12 when irradiated with an Nd:YAG pulsed laser of 1064 nm. The more the amount of hexagonal ZnO or hexagonal GeO2 increased, the more the SHG emission intensity increased. Both of hexagonal ZnO and hexagonal GeO2 do not have centrosymmetry and cause SHG, while rhombohedral Zn2GeO4 has centrosymmetry and does not. Therefore, the SHG emission intensity was changed with the amounts of these ZnO and GeO2 crystals. ©2016 The Ceramic Society of Japan. All rights reserved.

journal of the ceramic society of japan

Second-order nonlinear green light emission in sol&amp;ndash;gel derived opaque ZnO&amp;ndash;GeO&lt;sub&gt;2&lt;/sub&gt; oxides by near-infrared laser irradiation