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Analyses and computations of asymmetric Z-scan for large phase shift from diffraction theory
作者姓名:任立勇  姚保利  侯洵  刘立人  周常河
作者单位:Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,State Key Laboratory of Transient Optics Technology,Xi'an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences,Xi'an 710068,State Key Laboratory of Transient Optics Technology,Xi'an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences,Xi'an 710068,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800
基金项目:This work was supported by the National Natural Science Foundation of China under Grant No. 60007009,the President Foundation of Chinese Academy of Sciences under Grant No. 40007059.
摘    要:Based on Presnel-Kirchhoff diffraction theory, we set up a diffraction model of nonlinear optical media to Gaussian beam, which can interpret the Z-scan phenomenon from a new way. This theory is not only well consistent with the conventional Z-scan theory in the case of small nonlinear phase shift, but also can fit for the lager nonlinear phase shift. Numeric computations indicate the shape of the .Z-scan curve is greatly affected by the value of the nonlinear phase shift. The symmetric dispersion-like Z-scan curve is only valid for small nonlinear phase shift (|Δφ0| < π), but with increasing the nonlinear phase shift, the valley of the transmittance is severely suppressed and the peak is greatly enhanced. Further calculations show some new interesting results.


Analyses and computations of asymmetric Z-scan for large phase shift from diffraction theory
Abstract:Based on Fresnel-Kirchhoff diffraction theory, we set up a diffraction model of nonlinear optical media toGaussian beam, which can interpret the Z-scan phenomenon from a new way. This theory is not onlywell consistent with the conventional Z-scan theory in the case of small nonlinear phase shift, but alsocan fit for the lager nonlinear phase shift. Numeric computations indicate the shape of the Z-scan curveis greatly affected by the value of the nonlinear phase shift. The symmetric dispersion-like Z-scan curveis only valid for small nonlinear phase shift (|△φo| <π), but with increasing the nonlinear phase shift, thevalley of the transmittance is severely suppressed and the peak is greatly enhanced. Further calculationsshow some new interesting results.
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