Results 251 to 260 of about 223,084 (301)

Investigation of tetrabenzporphyrin by the Z-scan technique

Optics Letters, 1995
The nonlinear transmission of tetrabenzporphyrin dissolved in tetrahydrofuran was measured with the Z-scan technique at 532 nm with nanosecond pulses. The excited-state absorption cross section, the excited-state refractive-index cross section, and the linear and nonlinear absorption contributing to a thermal index change have been determined.
G L, Wood, M J, Miller, A G, Mott
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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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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
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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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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
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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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Z-scan technique for nonlinear materials characterization

SPIE Proceedings, 1997
We review Z-scan and related techniques for the measurement of the nonlinear optical properties of materials. The Z-scan is a simple technique for measuring the change in phase induced on a laser beam upon propagation through a nonlinear material it gives both the sign and magnitude of this phase change, ΔΦ, which is simply related to the change in ...
Eric W. Van Stryland, Mansoor Sheik-Bahae   +1 more
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Z-scan technique for investigation of the noninstantaneous optical Kerr nonlinearity

Optics Letters, 2009
By treating laser-induced optical Kerr nonlinearity as a noninstantaneous decaying process, we present the pulse-duration-dependent Z-scan analytical expressions for an arbitrary aperture and an arbitrary nonlinear magnitude. This theory has the capacity to characterize the third-order nonlinear refraction induced by a laser pulse with its temporal ...
Gu, B., Wang, H.-T., Ji, W.
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Numerical study of the medium thickness in the Z-scan technique

SPIE Proceedings, 2011
The optical characterization of nonlinear media through the Z-scan technique considers initially a thin medium (with a thickness much less than the beam depth of focus). It has been observed that increasing the thickness of the medium the transmittance increases, this means that n2 increases, for this reason we will present a numerical model to ...
I. Severiano Carrillo, M. M. Méndez Otero, M. L. Arroyo Carrasco, M. D. Iturbe Castillo   +3 more
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Z-scan technique through beam dimensions measurements

SPIE Proceedings, 2003
In the present work a modification of the well-known z-scan technique is presented. It is based on the direct measurement of the beam dimensions in the far field rather than the transmittance of the irradiance through an aperture. More specifically, the quantity measured in the case of a circular Gaussian incident beam is the beam radius in the far ...
G. Tsigaridas, M. Fakis, I. Polyzos, Peter Persephonis, V. Giannetas   +4 more
openaire   +1 more source