Single crystal of lithium potassium sulphate, a nonlinear optical material, was grown from aqua solution by slow evapo- ration method at room temperature. The cell parameters were estimated by single crystal X-ray dif...Single crystal of lithium potassium sulphate, a nonlinear optical material, was grown from aqua solution by slow evapo- ration method at room temperature. The cell parameters were estimated by single crystal X-ray diffraction analysis. The optical transmittance of the crystal was recorded using the UV-Vis-NIR spectrophotometer and the optical band gap was calculated using this method. The second harmonic generation efficiency was measured by Kurtz and Perry powder technique and the phase-matching property was confirmed. The hardness of the material was measured by Vicker’s hardness test.展开更多
It is well known that the incorporation of fluorine usually blue-shifts the absorption edge of a crystal due to its large electronegativity.Herein,we validate the new functionality of fluorine that leads to the strong...It is well known that the incorporation of fluorine usually blue-shifts the absorption edge of a crystal due to its large electronegativity.Herein,we validate the new functionality of fluorine that leads to the strong second harmonic generation(SHG)effect in a unique nonlinear optical(NLO)bismuth borate,BiB_(2)O_(4)F,where F coordinates to both B^(3+)and Bi^(3+)cations.The F-incorporation not only forms a more asymmetric unit[BO_(3)F]compared to the almost optical isotropic[BO4],but also withdraws the non-bonding electrons of Bi^(3+),increasing its local polarization;thus the total SHG efficiency is increased significantly.Indeed,experimental measurements and first-principles calculations both support our anticipation that BiB_(2)O_(4)F is a phase-matchable NLO material with an exceptionally large SHG response.In order to further consolidate the functionality of fluorine,a comparison study with the structurally similar compound BiB_(2)O_(4)(OH)was performed.展开更多
IR NLO sulfides BaMnSnS_(4) and BaCdGeS_(4) exhibit significant SHG efficiencies(1.2 and 0.3AgGaS_(2))with phase-matching behavior and high laser-induced damage thresholds(10 and 13AgGaS_(2)).Their strong SHG efficien...IR NLO sulfides BaMnSnS_(4) and BaCdGeS_(4) exhibit significant SHG efficiencies(1.2 and 0.3AgGaS_(2))with phase-matching behavior and high laser-induced damage thresholds(10 and 13AgGaS_(2)).Their strong SHG efficiencies mainly originate from SnS_(4) and GeS_(4) tetrahedra that are being modulated by highly distorted MnS_(4) and CdS_(4) tetrahedra.展开更多
文摘Single crystal of lithium potassium sulphate, a nonlinear optical material, was grown from aqua solution by slow evapo- ration method at room temperature. The cell parameters were estimated by single crystal X-ray diffraction analysis. The optical transmittance of the crystal was recorded using the UV-Vis-NIR spectrophotometer and the optical band gap was calculated using this method. The second harmonic generation efficiency was measured by Kurtz and Perry powder technique and the phase-matching property was confirmed. The hardness of the material was measured by Vicker’s hardness test.
基金supported by the Nature Science Foundation of China(grants 21101175,21171178,91222106,91022036 and 11174297)National Basic Research Project of China(grants 2010CB630701 and 2011CB922204).
文摘It is well known that the incorporation of fluorine usually blue-shifts the absorption edge of a crystal due to its large electronegativity.Herein,we validate the new functionality of fluorine that leads to the strong second harmonic generation(SHG)effect in a unique nonlinear optical(NLO)bismuth borate,BiB_(2)O_(4)F,where F coordinates to both B^(3+)and Bi^(3+)cations.The F-incorporation not only forms a more asymmetric unit[BO_(3)F]compared to the almost optical isotropic[BO4],but also withdraws the non-bonding electrons of Bi^(3+),increasing its local polarization;thus the total SHG efficiency is increased significantly.Indeed,experimental measurements and first-principles calculations both support our anticipation that BiB_(2)O_(4)F is a phase-matchable NLO material with an exceptionally large SHG response.In order to further consolidate the functionality of fluorine,a comparison study with the structurally similar compound BiB_(2)O_(4)(OH)was performed.
基金supported by the NSF of China(21827813,21701176)the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB20010000)+1 种基金Chinese Academy of Sciences YJKYYQ20180006Scientific Research Fund of Natural Science Foundation of Fujian Province,China(2018J05034).
文摘IR NLO sulfides BaMnSnS_(4) and BaCdGeS_(4) exhibit significant SHG efficiencies(1.2 and 0.3AgGaS_(2))with phase-matching behavior and high laser-induced damage thresholds(10 and 13AgGaS_(2)).Their strong SHG efficiencies mainly originate from SnS_(4) and GeS_(4) tetrahedra that are being modulated by highly distorted MnS_(4) and CdS_(4) tetrahedra.
