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Role of the aperture in z-scan experiments: A parametric study

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Chinese Physics B 2015年第11期24卷 280-284页

作者： M.R.Rashidian Vaziri Laser and Optics Research School NSTRI

In close-aperture z-scan experiments, a small aperture is conventionally located in the far-field thereby enabling the detection of slight changes in the laser beam profile due to the Kerr-lensing effect. In this work, by numerically solving the Fresnel-Kirchhoff diffraction integrals, the amount of transmitted power through apertures has been evaluated and a parametric study on the role of the various parameters that can influence this transmitted power has been done. In order to perform a comprehensive analysis, we have used a nonlinear phase shift optimized for nonlocal nonlinear media in our calculations. Our results show that apertures will result in the formation of symmetrical fluctuations on the wings of z-scan transmittance curves. It is further shown that the appearance of these fluctuations can be ascribed to the natural diffraction of the Gaussian beam as it propagates up to the aperture plane. Our calculations reveal that the nonlocal parameter variations can shift the position of fluctuations along the optical axis, whereas their magnitude depends on the largeness of the induced nonlinear phase shift. It is concluded that since the mentioned fluctuations are produced by the natural diffraction of the Gaussian beam itself, one must take care not to mistakenly interpret them as noise and should not expect to eliminate them from experimental z-scan transmittance curves by using apertures with different sizes.

关键词： nonlinear optics Kerr effect z-scan electromagnetic wave propagation

Theory of z-scan technique using Gaussian-Bessel beams with a phase object

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Chinese Physics B 2010年第7期19卷 251-255页

作者：金肖税敏王玉晓李常伟杨俊义张学如杨昆宋瑛林 Department of Physics Harbin Institute of Technology Department of Physics Soochow University

This paper reports the theoretical study of combining z-scan technique with Gauss-Bessel （GB） beams beside a phase object （PO） to measure the third-order nonlinear susceptibility components. By using this method, the sign of refractive index which depends on the shape of the close aperture z-scan curve can be easily determined. Meanwhile, the magnitude of nonlinear coefficients can also be deduced by theoretical fit. The proposed method is advantageous for high sensitivity and imposes a lower stress in the cases of fragile materials, since small pulse energy is enough for the measurement of nonlinear coefficients. Predictions of the models are compared with Gaussian z-scan measurement and GB z-scan measurement. By using GB beams with a PO, the sensitivity of z-scan measurements is found to be a factor of over 60 times greater than for Gaussian beams and 2 times greater than for Gaussian-Bessel beams.

关键词： Gaussian-Bessel beams phase object z-scan

Study　of　Nonlinear　Optical　Properties　of　Organic　Material　Utilizing　Two－color　z－scan

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Chinese Journal of Lasers 1995年第5期B4卷 463-468页

作者： YANG Miao YIN zuxing LI Feng SONG Yinglin LI Chunfei (Department of Physics,Harbin Institute of Technology, Harbin 150001, China) Harbin Inst of Technology Harbin China

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关键词： z-scan nonlinear refraction C60 4-BCMU

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z-scan的基础理论及技术回顾(英文)

功能材料 2006年第3期37卷 474-477页

作者：关博许小亮中国科学技术大学结构分析实验室

由Sheik-Bahae于1989年提出的z-scan技术已经成为在非线性光学和材料科学领域里的一项非常有用的测量方法,它能简单而灵敏地测量非线性光折射率和吸收率。本文概要地讨论了z-scan技术并介绍了它的最新进展,其中着重讨论了高斯分解法对... 详细信息

由Sheik-Bahae于1989年提出的z-scan技术已经成为在非线性光学和材料科学领域里的一项非常有用的测量方法,它能简单而灵敏地测量非线性光折射率和吸收率。本文概要地讨论了z-scan技术并介绍了它的最新进展,其中着重讨论了高斯分解法对此项技术的理论研究。

关键词： z-scan 菲涅耳反射光原理非线性光折射率非线吸收率

z-scan分析CdS纳米晶掺杂玻璃的光学非线性

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红外与激光工程 2010年第4期39卷 694-697页

作者：杨昕宇向卫东张希艳梁晓娟刘海涛长春理工大学材料科学工程学院吉林长春130022 温州大学化学与材料工程学院浙江温州325035

利用溶胶-凝胶方法合成了CdS纳米晶掺杂Na2O-B2O3-SiO2玻璃。通过透射电镜(TEM)以及附带的扫描模式透射(STEM),X射线能量散射谱(EDX)和高分辨透射电镜(HRTEM)分析CdS颗粒的形貌、微结构以及组成。结果显示,在钠硼硅玻璃先驱体中生成了Cd... 详细信息

利用溶胶-凝胶方法合成了CdS纳米晶掺杂Na2O-B2O3-SiO2玻璃。通过透射电镜(TEM)以及附带的扫描模式透射(STEM),X射线能量散射谱(EDX)和高分辨透射电镜(HRTEM)分析CdS颗粒的形貌、微结构以及组成。结果显示,在钠硼硅玻璃先驱体中生成了CdS纳米晶,其晶相结构为六方相结构,颗粒尺寸在10～20 nm。此外,利用z-scan技术在波长为770 nm研究该玻璃的三阶非线性光学性质。结果表明:该玻璃的三阶光学非线性折射率γ,三阶非线性吸收系数β以及三阶非线性磁化率χ(3)分别为-2.16×10-16 m2W-1,6.32×10-11 mW-1和7.32×10-10 esu,优于此前一些关于CdS纳米晶掺杂在不同基体中所得到的三阶非线性光学性质的结果。

关键词：三阶光学非线性 z-scan 溶胶-凝胶硫化镉

Nonlinear optical properties in double-sided nonlinear media with z-scan technique based on the Huygens-Fresnel principle

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Chinese Physics B 2006年第8期15卷 1810-1814页

作者：欧阳秋云张学如蒋礼常青王玉晓宋瑛林 Department of Physics Harbin Institute of Technology Harbin 150001 China College of Electronic Engineering Heilongjiang University Harbin 150080 China

We present a theoretical model to analyse the propagation of a Gaussian laser beam through double-sided nonlinear media. This model is based on the Huygens-Fresnel diffraction integral method. This theoretical model is not only consistent with the cascade structure model for a small nonlinear phase-shift but also can be used for a large nonlinear phase-shift. It has been verified that it is suitable to characterize the double-sided nonlinear media compared with the cascade structure model. A good agreement between the experimental data and the results from the theoretical model is obtained. It will be useful for the design of multi-sided nonlinear materials.

关键词： optical nonlinearity double-sided nonlinear media z-scan

Investigation on Third-order Optical Nonlinearity of Ni-Azo Metal Complex by the z-scan Technique

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Chinese Journal of Lasers 2000年第3期9卷 42-46页

作者： LIANG zhijian-1 WANG Shuangqing-2 TANG Fulong-1 GAN Fuxi-1 YU Baolong-3 ( -1 Shanghai Institute of Optics and Fine Mechanics, The Chinese Academy of Sciences, Shanghai 201800, China -2 Institute of Photographic Chemistry, The Chinese Academy 中科院上海光学精密机械所上海中科院感光化学所北京河南大学河南开封

Third-order optical nonlinearity of Ni-azo metal complex i n solution was investigated by the z-scan technique with 38 ps laser pulse excitation at 1.064 μm. Self-defocusing was observed, and third-order nonlinear susceptibility χ- (3) pure and the second hyperpolarizability 〈γ〉 were measured to be 1.8×10- -11 esu and 1.0×10- -32 esu, respectively.

关键词： third-order optical nonlinearity z-scan Ni-Azo metal complex

Effect of coupling between linear absorption and nonlinear absorption on z-scan measurements

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Chinese Physics B 2005年第3期14卷 546-550页

作者：臧维平田建国刘智波周文远宋峰张春平 PhotonicsCentre CollegeofPhysicsNankaiUniversityTianjin300071China

The contribution of multiphoton absorption to open-aperture z-scan measurements is analysed by coordinate *** approximate closed-form solution is obtained, which is suitable for application in higher-optical power ***... 详细信息

关键词： z-scan coordinate tranformation nonlinear optics and multiphoton absorption

z-scan technique: To measure the total protein and albumin in blood

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Journal of Biomedical Science and Engineering 2010年第3期3卷 285-290页

作者： A.N. Dhinaa P.K. Palanisamy 不详

z-scan technique is an effective tool for measuring the optical nonlinearity of the materials. By using this technique the measurement was made for total protein and albumin. The nonlinear refractive index of the total protein and albumin were found to vary linearly with concentration. Hence by calculating the nonlinear refractive index it is possible to measure their concentration in the sample. The values measured thus are found in equivalence with conventional colorimetric method.

关键词： z-scan Technique Nonlinear Refractive Index Total Protein Albumin