| 基于衍射理论的Z扫描技术分析与数值模拟 |
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| 引用本文： | 王彩丽,牛燕雄,崔云霞,牛海莎,和婷,张鹏. 基于衍射理论的Z扫描技术分析与数值模拟[J]. 强激光与粒子束, 2012, 24(9): 2220-2224. DOI: 10.3788/HPLPB20122409.2220 |
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| 作者姓名： | 王彩丽 牛燕雄 崔云霞 牛海莎 和婷 张鹏 |
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| 作者单位： | 1.北京航空航天大学 仪器科学与光电工程学院, 北京 1 001 91 |
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| 摘 要： | 以菲涅耳-基尔霍夫衍射理论为基础，对通过非线性介质的高斯光束传输行为进行理论分析，分别给出了强吸收、无吸收情况下开孔、闭孔Z扫描曲线公式；对不同条件下非线性介质的归一化透过率进行数值模拟计算，发现Z扫描曲线透射峰和透射谷表现出3种新的特性:随着入射激光峰值光强的增加，Z扫描曲线透射峰的高度受到抑制,而透射谷则加强变得更深；非线性相移的增加对Z扫描曲线透射峰和透射谷均有增高和加深的作用；激光束束腰半径越大，Z扫描曲线的峰谷特征越明显。
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| 关 键 词： | Z扫描技术 高斯光束 非线性介质 反饱和吸收 |
| 收稿时间： | 2011-07-13 |
Technical analysis and numerical simulation of Z-scan characteristics using Fresnel-Kirchhoff diffraction theory |
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| Wang Caili,Niu Yanxiong,Cui Yunxia,Niu Haisha,He Ting,Zhang Peng. Technical analysis and numerical simulation of Z-scan characteristics using Fresnel-Kirchhoff diffraction theory[J]. High Power Laser and Particle Beams, 2012, 24(9): 2220-2224. DOI: 10.3788/HPLPB20122409.2220 |
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| Authors: | Wang Caili Niu Yanxiong Cui Yunxia Niu Haisha He Ting Zhang Peng |
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| Affiliation: | 1.School of Instrument Science and Optoelectronics Engineering,Beihang University,Beijing 100191,China |
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| Abstract: | Based on Fresnel-Kirchhoff diffraction theory, the propagation behavior of the Gaussian beam passing through the nonlinear optical medium is theoretically analyzed under strong absorption or without absorption. A unified equation is derived, which can describe the open-aperture Z-scan curve and the closed-aperture Z-scan curve. The numerical simulation of Z-scan curve under different conditions shows that the transmission Z-scan curve with peak and valley has some new features. As the incident laser peak intensity increases, the transmittance peak is suppressed and the valley is strengthened; increasing of nonlinear phase shift can heighten the peak and deepen the valley; the larger the laser beam waist radiusis, the more obvious the features of peak-valley configuration are. |
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| Keywords: | Z-scan technique Gaussian beam nonlinear medium reverse saturable absorption |
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