Approach dealing with transversely spatial profile of pump laser in Z-scan technique
The spatial pulse profile makes experimental values of Two-and three photon absorption (TPA and 3PA) coefficient deviate from its true value. We report an approach taking account of the influence of pump laser pulse profile on the nonlinear absorption coefficients (NAC) in Z-scan technique. We developed a new approach in which the factor (f factor) introduced to describe the influence coming from the spatial profile of laser on two and three photon absorption coefficient. The approximation of the approach is also estimated quantitatively. With Gaussian beams the numerically related results show that, compared with NAC based on the way dealing with the pulse in usual Z-scan, the relative differences of 2-photon and 3-photon absorption coefficients obtained based on the traditional one are less than 4.2％ and 16.7％. The results suggest that the factor may become useful and simple parameters in dealing with the NAC deviation resulting from the pump laser pulse envelopes for the purpose of shortcutting the Z-scan datum process.
Y Zhang S Y WANG P D Zhao D Y Wang M Liu Z D Zhang
School of Science, Hebei University of Technology, 300130, Tianjin PRC
国际会议
3rd International Photonics & OptoElectronics Meetings(第三届国际光子与光电子学会议 POEM 2010)
武汉
英文
1-5
2010-11-03（万方平台首次上网日期，不代表论文的发表时间）