Role of the aperture in Z-scan experiments: A parametric study

doi:10.1088/1674-1056/24/11/114206

Abstract In close-aperture Z-scan experiments, a small aperture is conventionally located in the far-field thereby enabling the detection of slight changes in the laser beam profile due to the Kerr-lensing effect. In this work, by numerically solving the Fresnel-Kirchhoff diffraction integrals, the amount of transmitted power through apertures has been evaluated and a parametric study on the role of the various parameters that can influence this transmitted power has been done. In order to perform a comprehensive analysis, we have used a nonlinear phase shift optimized for nonlocal nonlinear media in our calculations. Our results show that apertures will result in the formation of symmetrical fluctuations on the wings of Z-scan transmittance curves. It is further shown that the appearance of these fluctuations can be ascribed to the natural diffraction of the Gaussian beam as it propagates up to the aperture plane. Our calculations reveal that the nonlocal parameter variations can shift the position of fluctuations along the optical axis, whereas their magnitude depends on the largeness of the induced nonlinear phase shift. It is concluded that since the mentioned fluctuations are produced by the natural diffraction of the Gaussian beam itself, one must take care not to mistakenly interpret them as noise and should not expect to eliminate them from experimental Z-scan transmittance curves by using apertures with different sizes.

Keywords: nonlinear optics Kerr effect Z-scan electromagnetic wave propagation

Received: 14 March 2015
Revised: 25 May 2015
Accepted manuscript online:

PACS:	42.65.-k	(Nonlinear optics)
	42.65.Jx	(Beam trapping, self-focusing and defocusing; self-phase modulation)
	42.60.Jf	(Beam characteristics: profile, intensity, and power; spatial pattern formation)

Corresponding Authors: M. R. Rashidian Vaziri
E-mail: rezaeerv@gmail.com

Cite this article:

M. R. Rashidian Vaziri Role of the aperture in Z-scan experiments: A parametric study 2015 Chin. Phys. B 24 114206

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