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Z-Scan analysis of high-order nonlinear refraction effect induced by using elliptic Gaussian beam

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Chinese Physics B 2010年第6期19卷 541-547页

作者：郭世方田强 Department of Physics Beijing Normal University

The irradiance of an elliptic Gaussian beam that is high enough to excite high-order nonlinear refraction effect is used to calculate the normalized on-axis transmittance function in the Z-Scan technique by introducing complex beam parameters which make the calculation simpler. The transmittance formula is applied to the first-, first two-, and first three-order nonlinearities. Numerical evaluation shows that the symmetry no longer holds when using an elliptic Gaussian beam instead of a circular Gaussian beam. A distortion is observed in the central part of the curve, which decreases as ellipticity increases. Moreover, the variation of the normalized peak-valley difference decreases as ellipticity decreases.

关键词： Z-Scan elliptic Gaussian beam complex beam parameter high order

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

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

Nonlinear optical switching and all-figures of merit in Bi2S3-xSex/PMMA nanocomposite films investigated by z scan under visible CW laser

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Chinese Optics Letters 2020年第1期18卷 75-80页

作者： M.Y.Shubar H.L.Saadon Saeed J.Abbas Laser Applications Research Group(LARG) Department of PhysicsCollege of ScienceUniversity of BasrahBasrahIraq

Bi2S3-xSex/poly(methyl methacrylate)(PMMA)nanocomposite films were prepared using microwave assisted synthesis with different compositions of x.Crystal structure,surface morphology,and optical properties were investigated to characterize the prepared nanocomposite films.The crystallinity and optical band gap of the prepared Bi2S3-xSex/PMMA were affected by x.The prepared samples showed a blue shift in the absorption edge.The laser power dependent nonlinear refraction and absorption of Bi2S3-xSex/PMMA nanocomposite films were investigated by using the Z-Scan technique.The optical nonlinearity of the nanocomposite films exhibited switchover from negative nonlinear refraction to positive nonlinear refraction to negative nonlinear refraction effects,and from saturable absorption to reverse saturable absorption to saturable absorption with an increase and decrease in the composition.An interesting all-optical figure of merit was reported to assess the nanocomposite films for a practical device.It was calculated that the device all-figures of merit were based on the nonlinear response,which is important for the all-optical switching device.The results demonstrate that the optimized all-optical figures of merit can be achieved by adjusting the composition and input laser power,which can be used for the design of different all-photonic devices,and the results of nonlinear switching behavior can open new possibilities for using the nanocomposite films in laser Q-switching and mode-locking.

关键词： bismuth chalcogenides Bi2S3-xSex/PMMA nanocomposite Z-Scan technique nonlinear absorption and refraction all-optical figures of merit

基于单光束Z-Scan技术的非线性测量技术的发展

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光学技术 2009年第4期35卷 630-634页

作者：张立欣黑龙江大学电子工程学院哈尔滨150080

介绍了由Sheik-Bahae等人提出的、用于测量材料三阶非线性的单光束Z-Scan技术。该技术能同时测量材料的非线性折射和非线性吸收,并能给出非线性折射的符号。介绍了以该技术为基础并经改进的几种测量技术:遮挡Z-Scan,I-scan和微分Z-Scan... 详细信息

介绍了由Sheik-Bahae等人提出的、用于测量材料三阶非线性的单光束Z-Scan技术。该技术能同时测量材料的非线性折射和非线性吸收,并能给出非线性折射的符号。介绍了以该技术为基础并经改进的几种测量技术:遮挡Z-Scan,I-scan和微分Z-Scan。引出了近10年来新发展的相位4f相干成像技术,并对其基本原理进行了阐述,分析了其应用特点。该技术具有使用单脉冲进行测量,光路简单,测量灵敏度高,无样品移动等特点。

关键词：非线性光学 Z-Scan 4f系统非线性折射

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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

Single Beam Z-Scan Measurement of Nonlinear Refractive Index of Crude Oils

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Journal of Modern Physics 2014年第5期5卷 280-284页

作者： Adeleh Granmayeh Rad Department of Physics Faculty of Sciences Roudehen Branch Islamic Azad University Roudehen Iran

Nonlinear properties of two different crude oils from west-south Iran reservoirs have been investigated using the single beam Z-Scan technique. The nonlinear refractive indices of the samples were measured by use of diode laser in the CW regime and at the wavelength 660 nm. The experiment results showed that the samples have large and negative refractive index nonlinear refraction coefficient. These results showed that the crude oil has significant nonlinear properties and it could be a candidate for photonic and nonlinear optical devices and also this information can be used in petroleum science and oceanology and etc.

关键词： Crude Oil Z-Scan Method Nonlinear Refractive Index

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

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 Department of Physics Anna University Chennai

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