Results 271 to 280 of about 3,025,283 (308)

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
openaire   +1 more source

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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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 ...
openaire   +1 more source

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
openaire   +1 more source

Heterodyne Z-scan measurements of slow absorbers

Journal of Applied Physics, 2007
We report a single-beam heterodyne Z-scan method capable of measuring slow response nonlinear refraction of absorbers with excellent sensitivity. By imposing a small sinusoidal modulation on the incoming continuous wave laser beam and recording both the magnitude and phase of the intensity transmitted through a small aperture, we are able to eliminate ...
I. Guedes, L. Misoguti, L. de Boni, S. C. Zilio   +3 more
openaire   +1 more source

Z-scan of ITO nanocrystals grown inside glass

Optics Letters
Indium tin oxide (ITO) nanocrystals 1–10 nm in size were grown via thermal treatment of a boroaluminosilicate parent glass. The nonlinear behavior of the obtained glass-ceramic was investigated with the Z-scan technique using 550 ps pulses of a 532 nm source at a 500 Hz repetition rate. The nonlinear response was rich, with the sample exhibiting third-
Amir Ashjari, Brian Topper, Doris Möncke   +2 more
openaire   +2 more sources

Z-scan formula for saturable Kerr media

Optics Communications, 1999
A Z-scan expression is derived for materials with a saturable Kerr index nonlinearity. An approximate solution is obtained for the normalized transmittance. Numerical calculations are given using this formula at near saturation light intensity.
S. Bian, M. Martinelli, R.J. Horowicz
openaire   +1 more source

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
openaire   +1 more source

Microstructural and Z-scan measurement of silver nanoparticles

Applied Surface Science, 2015
Abstract Silver nanoflowers were synthesized by the hydrothermal route. Formation of Ag nanoparticles is confirmed from the UV–vis spectrum where the surface plasmon absorption maxima are observed at 415–454 nm. FE-SEM and TEM images revealed the formation of silver nanoflowers and the flower-like silver nanostructures are estimated using ...
R. Sivakami, S. Dhanuskodi
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Z-scan study of the thermo-optical effect

Applied Physics B, 2004
In the case of cw Gaussian illumination, the thermo-optical n2 cannot be characterised by a constant value. It is shown that, if absorption has both linear and nonlinear contributions, the thermo-optical n2 consists of a position- and power-dependent term.
L. Pálfalvi, J. Hebling
openaire   +1 more source