Results 261 to 270 of about 4,093,256 (305)

Modulation Z-scan technique for characterization of photorefractive crystals

Optics Letters, 1996
We propose a simple single-beam configuration for characterization of the amplitude, speed of growth, and polarization properties of the photoinduced refractive-index change that is due to a drift photorefractive mechanism of nonlinearity in crystals, namely, the modulation Z-scan technique, based on the modulation of an externally applied electric ...
P A, Aguilar, J J, Mondragon, S, Stepanov   +2 more
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Z-scan dosimetry of gamma-irradiated PMMA

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2021
Abstract Poly (methyl methacrylate) (PMMA) is widely used in scientific and industrial applications. Because of its favorable properties, it is used in various fields such as optical, medical, and nuclear applications. Effects of ionization radiations on physical properties of PMMA have greatly studied in recent years.
A.M. Beigzadeh, M.R. Rashidian Vaziri
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Z-Scan Characteristics of Cascading Nonlinear Media

Chinese Physics Letters, 2003
We present a method, which combines the Gaussian decomposition method and the ``distributed-lens'' method, for analysing Z-scan curves of cascading nonlinear medium layers or a complicated cascading structure. A good agreement with the experimental data is obtained.
Zang Wei-Ping, Tian Jian-Guo, Liu Zhi-Bo, Zhou Wen-Yuan, Yang Xin-Jiang, Zhang Chun-Ping, Zhang Guang-Yin   +6 more
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Studies of Z-scan with "ring"-shaped beams

Technical Digest. Summaries of papers presented at the Conference on Lasers and Electro-Optics. Postconference Edition. CLEO '99. Conference on Lasers and Electro-Optics (IEEE Cat. No.99CH37013), 2003
Summary form only given. A variety of experimental techniques for measuring nonlinear refractive and absorptive coefficients has been invented and developed during the last two decades. Here we concentrate on perhaps the simplest of these methods-the so-called Z-scan technique.
D.I. Kovsh, D.J. Hagan, E.W. Van Stryland   +2 more
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Analysis of The Thick Medium Z-Scan

Nonlinear Optics: Materials, Fundamentals, and Applications, 1992
An analytic solution of the propagation equation for a symmetrical optical beam has been obtained, in the situation where the beam is focused within an optically nonlinear medium having a thickness greater than the depth of focus. Previous related work by the author has concentrated upon finding solutions, in continued-fraction format, within the ...
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Virtual Aperture Based Z-scan Technique

OSA Advanced Photonics Congress (AP) 2020 (IPR, NP, NOMA, Networks, PVLED, PSC, SPPCom, SOF), 2020
We demonstrate and verify the use of software generated virtual apertures on image based open-aperture z-scan data to simplify the z-scan technique to a single measurement, eliminating physical aperture alignment relates ...
Maria Merin Antony, C. S. Suchand Sandeep, Murukeshan Vadakke Matham   +2 more
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A Z-Scan Study of LiNbO3 Thin Films

Chinese Physics Letters, 2002
We have investigated the morphology and microstructure of carbon nanotubes and nanoparticles in cathode deposits prepared by self-sustained arc discharge. Scanning electron microscopy images indicate that there are two regions exhibiting different morphologies on the top surface of the cathode deposits.
Wang Qu-Quan, Shi Jing, Yang Bai-Feng, Liu Hai-Lin, Xiong Gui-Guang, Gong Qi-Huang, Xue Qi-Kun   +6 more
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Pseudo-nonlinear absorption in z-scan measurements

Journal of Optics, 2013
In the present study, pseudo-nonlinear absorption characteristics are numerically demonstrated in z-scan measurements even for samples of pure linear absorption materials. The pseudo-nonlinear absorption curves look similar to the nonlinear absorption curves in an open-aperture z-scan measurement.
Rui Wang, Jingsong Wei, Mufei Xiao
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Z-scan technique for elliptic Gaussian beams

Applied Physics B, 2003
A novel z-scan technique suitable for elliptic Gaussian beams is proposed. It is based on the direct measurement of the beam’s semiaxes in the far field instead of the irradiance transmitted through an aperture, as in the case of circular beams. This technique overcomes, for the first time, the insurmountable obstacles encountered when a z-scan ...
G. Tsigaridas, M. Fakis, I. Polyzos, P. Persephonis, V. Giannetas   +4 more
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Alternative Z-scan geometries for n2 measurements

Optical Society of America Annual Meeting, 1990
We have recently reported a simple experimental technique,1 Z-scan, for determining nonlinear refraction and nonlinear absorption. By using a Gaussian beam in a tight focusing geometry, the transmittance of a nonlinear medium through an aperture in the far field is measured as a function of the sample position with respect to the focal plane. A typical
A. A. Said, M. Sheik-Bahae, D. J. Hagan, E. W. van Stryland   +3 more
openaire   +1 more source