Results 251 to 260 of about 590,337 (295)

Managing thermal effects in eclipse Z-scan technique

2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference, 2007
In this paper, we introduce a new combination of the eclipse Z-scan with the recently introduced thermally managed Z-scan, that gains in sensitivity associated with the simultaneous measurement of the thermal and nonthermal contributions to the nonlinear (NL) refractive properties of photonic materials using relatively low laser intensities.
A. S. L. Gomes, E. L. Falcao Filho, Cid B. de Araujo, Diego Rativa, R. E. de Araujo   +4 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   +2 more sources

Blood Oxygen Saturation Measurements using Photoacoustic Z-scan Technique

Optics in the Life Sciences, 2015
Blood oxygen saturation (sO2) estimation is important in medicine. Nonlinear absorption coefficient (β) of various sO2 level blood samples were measured using photoacoustic Z-scan technique. Results depict linear dependency between β and sO2.
Albert Kamanzi, Maryam Hatamimoslehabadi, Chandra S Yelleswarapu   +2 more
openaire   +1 more source

Measuring optical nonlinearities using a heterodyne Z-Scan technique

2006 Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference, 2006
We present a heterodyne Z-Scan technique to obtain resonant nonlinearities (n 2 ) of Kerr-like media. From phase measurements we determine both signal and magnitude of n 2 . Results are presented for a ruby sample.
I. Guedes, L. Misoguti, L. de Boni, S. C. Zilio   +3 more
openaire   +1 more source

Optical nonlinearities of InN by reflection Z-scan technique

SPIE Proceedings, 2014
The optical nonlinearities of semiconductor bulk material Indium nitride (InN) have been investigated by Reflection Z-scan technique (RZ-scan) at the wavelength of 532nm with 21ps laser pulse. Top hat beam is used in order to get high spatial quality. Different from the normal RZ-scan device, instead of moving the sample, the lens before the sample is ...
Jiping Jia, Yong Yang, Yunyi Yang, Zhengguo Xiao, Yu Fang, Yinglin Song   +5 more
openaire   +1 more source

Novel high sensitivity thermal managed eclipse Z-scan technique

SPIE Proceedings, 2007
The field of Nonlinear Optics has provided many techniques to characterize photonic materials. The Z-scan method is a well estabileshed technique that exploits front wave distortions of the light beam to determine the nonlinear properties of optical materials.
Anderson S. L. Gomes, Edilson L. Falcão Filho, Cid B. de Araújo, Diego Rativa, Renato E. de Araujo   +4 more
openaire   +1 more source

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.
openaire   +2 more sources

Optical nonlinearities of Fe2O3 nanoparticles investigated by Z-scan technique

Optical Materials, 1997
Abstract The single beam Z-scan technique has been used to measure the third-order nonlinear refractive index, γ, the two-photon absorption coefficient, s, and the variation of refractive index per unit photoexcited carrier density σ r , and the free carrier absorption cross section σ ab for quantum-confined Fe 2 O 3 nanoparticles coated by a ...
Baolong Yu, Congshan Zhu, Fuxi Gan, Xiaochum Wu, Guilan Zhang, Guoqing Tang, Wenju Chen   +6 more
openaire   +1 more source

Optical nonlinearity of Bi2O3 nanoparticles studied by Z-scan technique

Journal of Applied Physics, 1997
The third-order optical nonlinear susceptibilities of Bi2O3 nanoparticles coated by a layer of stearic acid in toluene sol and bare in hydrosol were measured by the Z-scan technique. The nonlinear susceptibility of the coated Bi2O3 nanoparticles was found to be two orders of magnitude greater than that of the bulk Bi2O3.
Baolong Yu, Congshan Zhu, Fuxi Gan
openaire   +1 more source

Diffractive optical element for improving the Z-scan technique sensitivity

SPIE Proceedings, 2008
One of the most successful experimental technique for determining nonlinear properties of optical materials is the Z-scan technique. Interaction between a high intensity beam with a Kerr medium gives rise to a lensing effect that implies focusing or defocusing of the beam which is transformed into transmittance variations of a diaphragm set in the ...
R. de Saint Denis, M. Fromager, E. Cagniot, K. Ait-Ameur   +3 more
openaire   +1 more source