A new vector theory which concerns the necessary and sufficient conditions of the self-trapping of a linearly polarized light beam in Kerr media is presented after a generalization of Fermat's principle. It is rig...A new vector theory which concerns the necessary and sufficient conditions of the self-trapping of a linearly polarized light beam in Kerr media is presented after a generalization of Fermat's principle. It is rigidly proven under these conditions that 1+1-dimensional spatial solitons can exist in Kerr media but 2+1-dimensional solitons cannot. A new form of the general equation for 1+1-dimensional solitons in Kerr media is put forward and some of its solutions have been obtained.展开更多
Pattern formation in azobenzene polymer film by degenerate four-wave mixing is reported.Island arrays with specific patterns are analyzed with scanning electron microscopy and polarizing optical microscopy.It is demon...Pattern formation in azobenzene polymer film by degenerate four-wave mixing is reported.Island arrays with specific patterns are analyzed with scanning electron microscopy and polarizing optical microscopy.It is demonstrated that the control of photo-induced nanostructure sized micropattern in the nonlinear organic film is possible by using properly polarized writing beams with the total incident power exceeding a certain threshold.展开更多
When two beams of incoherent cw mode-locked ps laser pulses were incident upon opposite faces perpendicular to the a-axis of a Cu-doped KNSBN crystal,no mutually pumped phase conjugation as that generated by continuou...When two beams of incoherent cw mode-locked ps laser pulses were incident upon opposite faces perpendicular to the a-axis of a Cu-doped KNSBN crystal,no mutually pumped phase conjugation as that generated by continuous waves was observed,however,the stronger laser beam generated its self-pumped phase conjugation which was weakened by the weaker one.When the intensities of the two beams were equal,self-pumped phase conjugation was completely quenched.展开更多
Color centers stable at room temperature with absorption bands peaking at 365m,460nm,540nm and 620nm were produced in LiNbO3 crystals byγ-radiation,Measurements with XPS(X-ray photoelectron energy spectroscopy)and ES...Color centers stable at room temperature with absorption bands peaking at 365m,460nm,540nm and 620nm were produced in LiNbO3 crystals byγ-radiation,Measurements with XPS(X-ray photoelectron energy spectroscopy)and ESR(electron spin resonance)techniques show that the concentration of Nb^(4+)ion is high in the reduced LiNbO3 crystal but no typical ten-line Nb^(4+)ESR spectrum appears.The experimental results can be explained by the Nb^(4+)ion-F^(+)center association model.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No.69789801。
文摘A new vector theory which concerns the necessary and sufficient conditions of the self-trapping of a linearly polarized light beam in Kerr media is presented after a generalization of Fermat's principle. It is rigidly proven under these conditions that 1+1-dimensional spatial solitons can exist in Kerr media but 2+1-dimensional solitons cannot. A new form of the general equation for 1+1-dimensional solitons in Kerr media is put forward and some of its solutions have been obtained.
基金Supported by the National Natural Science Foundation of China under Grant No.19604015.
文摘Pattern formation in azobenzene polymer film by degenerate four-wave mixing is reported.Island arrays with specific patterns are analyzed with scanning electron microscopy and polarizing optical microscopy.It is demonstrated that the control of photo-induced nanostructure sized micropattern in the nonlinear organic film is possible by using properly polarized writing beams with the total incident power exceeding a certain threshold.
文摘When two beams of incoherent cw mode-locked ps laser pulses were incident upon opposite faces perpendicular to the a-axis of a Cu-doped KNSBN crystal,no mutually pumped phase conjugation as that generated by continuous waves was observed,however,the stronger laser beam generated its self-pumped phase conjugation which was weakened by the weaker one.When the intensities of the two beams were equal,self-pumped phase conjugation was completely quenched.
文摘Color centers stable at room temperature with absorption bands peaking at 365m,460nm,540nm and 620nm were produced in LiNbO3 crystals byγ-radiation,Measurements with XPS(X-ray photoelectron energy spectroscopy)and ESR(electron spin resonance)techniques show that the concentration of Nb^(4+)ion is high in the reduced LiNbO3 crystal but no typical ten-line Nb^(4+)ESR spectrum appears.The experimental results can be explained by the Nb^(4+)ion-F^(+)center association model.
