Results 261 to 270 of about 3,025,283 (308)

A general Z-scan theory

CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference, 2009
A novel Z-scan theory based on the solution of the nonlinear paraxial wave equation, completed by the Huygens–Fresnel principle is introduced. This theory is valid for the general case, i.e. for thick samples and large nonlinearities including both nonlinear refraction and absorption.
L. Pálfalvi, B. C. Tóth, G. Almási, J. A. Fülöp, J. Hebling   +4 more
openaire   +1 more source

Single-beam differential z-scan technique

Applied Optics, 2007
We report a single-beam, differential z-scan technique with improved sensitivity for the determination of nonlinear absorption and refraction of materials. A sample is scanned in the direction of beam propagation as usual, but, in addition, its longitudinal position is dithered, producing a detector signal proportional to the spatial derivative of only
Jean-Michel, Ménard, Markus, Betz, Iliya, Sigal, Henry M, van Driel   +3 more
openaire   +2 more sources

Saturation Effects in Z-Scan Measurements

Japanese Journal of Applied Physics, 1996
We investigate the behavior of the Z-scan technique in the case where the phase of the electric field departs from a Gaussian due to the saturation of the optical nonlinearity. The usual Gaussian decomposition theoretical approach cannot describe experimental results obtained with well-characterized chromium-doped saturable absorbers: ruby
Luimar C. Oliveira, Tomaz Catunda Tomaz Catunda, Sérgio C. Zilio Sérgio C. Zilio   +2 more
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Focus introduction: Z-scan technique

Optik, 2017
Abstract Since the introduction of the Z-scan, which is widely used to measure the nonlinear optical properties of material. The result of measurement mainly depends on light through the sample after a slight variation in the intensity, and the tiny change depends on the accuracy of the measurement sensitivity of Z-scan technology. Measurement scheme
Cheng-Bao Yao, Ke-Xin Zhang, Xing Wen
openaire   +1 more source

Z-scan studies on porphyrin derivative

Applied Physics B: Lasers and Optics, 1997
The nonlinear optical properties of a porphyrin derivative (T 3,4, BCEMPP) doped in boric acid glass were probed using the Z-scan technique at different argon-ion laser wavelengths. The nonlinear transmission characteristics exhibit saturable absorption at 457.9 nm and 476.5 nm while they are dominated by excited state absorption at 488.0 nm.
KANDASAMY, K, RAO, KD, DESHPANDE, R, PUNTAMBEKAR, PN, SINGH, BP, SHETTY, SJ, SRIVASTAVA, TS   +6 more
openaire   +2 more sources

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
openaire   +1 more source

Single-Beam Z-Scan: Measurement Techniques and Analysis

Journal of Nonlinear Optical Physics & Materials, 1997
The Z-scan technique is a popular method for measuring degenerate (single frequency) optical nonlinearities using a single laser beam. In order to perform reliable measurements, it is necessary to carefully characterize and control a number of experimental parameters, such as the beam quality, the power and temporal characteristics of the laser, the ...
P. B. Chapple, J. Staromlynska, J. A. Hermann, T. J. Mckay, R. G. Mcduff   +4 more
openaire   +4 more sources

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
openaire   +2 more sources

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
openaire   +1 more source

Z-scan formula for two-level atoms

Optics Communications, 2004
An analytical expression for the Z-scan signal from two-level atoms which show a saturable dispersive and absorptive nonlinearity is derived. An approximate solution is obtained for the normalized transmittance and compared with numerical calculations.
Yingxue Wang, M. Saffman
openaire   +1 more source