Results 251 to 260 of about 7,579,363 (303)
Some of the next articles are maybe not open access.
Single-beam differential z-scan technique
Applied Optics, 2007We 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 +3 more
openaire +2 more sources
Modulation Z-scan technique for characterization of photorefractive crystals
Optics Letters, 1996We 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 +2 more
openaire +2 more sources
Single-Beam Z-Scan: Measurement Techniques and Analysis
Journal of Nonlinear Optical Physics & Materials, 1997The 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 +4 more
openaire +4 more sources
Z-scan technique for elliptic Gaussian beams
Applied Physics B, 2003A 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 +4 more
openaire +1 more source
Z-scan technique for nonlinear materials characterization
SPIE Proceedings, 1997We 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 +1 more
openaire +1 more source
Z-scan technique for investigation of the noninstantaneous optical Kerr nonlinearity
Optics Letters, 2009By 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.
openaire +2 more sources
Numerical study of the medium thickness in the Z-scan technique
SPIE Proceedings, 2011The 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 +3 more
openaire +1 more source
Z-scan technique through beam dimensions measurements
SPIE Proceedings, 2003In 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 +4 more
openaire +1 more source
The validation of the Z-Scan technique for the determination of plasma glucose
SPIE Proceedings, 2013Glucose is the main energy source for the human body. The concentration of blood glucose is regulated by several hormones including both antagonists: insulin and glucagon. The quantification of glucose in the blood is used for diagnosing metabolic disorders of carbohydrates, such as diabetes, idiopathic hypoglycemia and pancreatic diseases.
Sarah I. Alves +11 more
openaire +1 more source
Optimization of Z-scan technique inside a 4f system
Nonlinear Optics, 2011Signal optimization is performed using Z-scan or EZ-scan techniques inside a 4-f system. Third-order nonlinear optical measurements are based on simple expressions obtained by simulation using Helmholtz wave equation through the imaging system.
Boudebs, Georges, Fedus, Kamil
openaire +2 more sources