Results 271 to 280 of about 223,084 (301)

z-scan: a simple sensitive technique for measuring refractive nonlinearities

Annual Meeting Optical Society of America, 1989
We present a simple yet highly sensitive technique for determining the sign and magnitude of nonlinear refraction. Using a single focused Gaussian beam with a constant input pulse energy, the far field transmittance is measured through a finite aperture as a function of the sample position with respect to the focal plane along the propagation path (z).
A. A. Said, M. Sheik-Bahae, T. H. Wei, J. Young, D. J. Hagan, M. J. Soileau, E. W. Van Stryland   +6 more
openaire   +1 more source

Population lensing effect in Cr:LiSAF probed by Z-scan technique

Optics Communications, 2006
Abstract An experiment has been performed for measuring a nonlinear refractive index that is due to the polarizability difference Δ α P between excited ( 4 T 2 ) and ground ( 4 A 2 ) states in a Cr 3+ :LiSAF crystal at λ  = 647 nm. The latter one is responsible for a population lensing effect which has been monitored by using the eclipsing Z ...
Nicolas Passilly, Elyes Haouas, Vivien Ménard, Richard Moncorgé, Kamel Aı¨t-Ameur   +4 more
openaire   +1 more source

Z-scan technique for thin media with any type of nonlinearity

Frontiers in Optics, 2005
Considering that a thin media with any type of nonlinearity can be described by a thin lens of focal length F, a general expression for the transmittance in the Z-scan technique is obtained.
Zulema Navarrete-Meza, M. David Iturbe-Castillo   +1 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

Analytical solution of on-axis beam propagation for Z-scan technique

Journal of the Optical Society of America B, 2009
An analytical solution of on-axis beam propagation is presented for determining the nonlinear refraction and nonlinear absorption of a thin nonlinear medium accurately, efficiently, and simultaneously by a single Z-scan method. This result is based on the general Huygens-Fresnel principle.
Fang-Qin Li, Xiao-Fu Zhang, Feng Yang, Nan Zong, Qin-Jun Peng, Da-Fu Cui, Zu-Yan Xu   +6 more
openaire   +1 more source

A colour image retrieval scheme based on Z-scanning technique

The Imaging Science Journal, 2013
This paper proposes a new colour image retrieval scheme using Z-scanning technique for content-based image retrieval (CBIR). In recent years, the CBIR is a popular research topic for image retrieval. This paper proposes a scheme which employs the Z-scanning technique to extract directional intensity features for measuring the similarity between query ...
openaire   +1 more source

Nonlinear optical study of Schiff bases using Z-scan technique

Optics and Laser Technology, 2020
Beata Derkowska-Zielinska, Magdalena Barwiolek, Christophe Cassagne   +2 more
exaly  

Modified Z-scan technique using a segmented photodiode

Nonlinear Frequency Generation and Conversion: Materials and Devices XVIII, 2019
Manuel Ferdinandus, Jamie Gengler, Michael Tripepi, Carl M. Liebig   +3 more
openaire   +1 more source

Investigation of optical nonlinearity of 3,3′-dimethylbiphenyl 4,4′-diamine and 4,4′-diisocyano-3,3′-dimethylbiphenyl using a Z-scan technique

Optics and Laser Technology, 2015
A Allahham
exaly  

Nonlinear optical investigations of Quinine and Quinotoxine salts by Z -scan technique

Optics and Laser Technology, 2017
A Allahham
exaly