Chinese Optics Letters, 2003, 1 (2): 02111, Published Online: Jun. 6, 2006
Analyses and computations of asymmetric Z-scan for large phase shift from diffraction theory Download: 604次
Abstract
Based on Fresnel-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.
Liyong Ren, Baoli Yao, Xun Hou, Liren Liu, Changhe Zhou. Analyses and computations of asymmetric Z-scan for large phase shift from diffraction theory[J]. Chinese Optics Letters, 2003, 1(2): 02111.