Journal ArticleDOI
Z-scan and spatial self-phase modulation of a Gaussian beam in a thin nonlocal nonlinear media
E. V. García Ramírez,M. L. Arroyo Carrasco,M. M. Méndez Otero,E. Reynoso Lara,S. Chavez-Cerda,M. D. Iturbe Castillo +5 more
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TLDR
In this paper, the Fraunhofer integral is used to obtain the on-axis intensity in a Z-scan experiment or the intensity pattern in a self-phase modulation experiment, and the model presented is adequate to describe samples with any magnitude of the maximum nonlinear photoinduced phase shift of purely refractive local or nonlocal nonlinear thin media.Abstract:
Considering that the nonlinear photoinduced phase shift to a Gaussian beam in a thin sample of nonlocal nonlinear media can be modeled as a Gaussian function to some real power the far-field can be calculated using the Fraunhofer integral. In this paper we calculate numerically this integral to obtain the on-axis intensity in a Z-scan experiment or the intensity pattern in a self-phase modulation experiment. Experimental results of samples under cw illumination are fitted using the model with a good correspondence between experimental and numerical results. The model presented is adequate to describe samples with any magnitude of the maximum nonlinear photoinduced phase shift of purely refractive local or nonlocal nonlinear thin media.read more
Citations
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Journal ArticleDOI
Z-scan theory for nonlocal nonlinear media with simultaneous nonlinear refraction and nonlinear absorption.
TL;DR: In this paper, the nonlinear photoinduced phase shift between the impinging and outgoing Gaussian beams from a non-local nonlinear sample has been generalized to its known counterpart for the case of pure refractive nonlinearity.
Journal ArticleDOI
Nonlinear refractive index measurement by Fresnel diffraction from phase object
TL;DR: In this paper, a simple and sensitive technique, based on Fresnel diffraction from phase objects, is proposed for specifying the nonlinear refractive index of a sample, which is obtained by measurement of the normalized intensity distribution of the Fresnel diffusion patterns.
Journal ArticleDOI
Third-order nonlinear optical properties of colloidal Au nanorods systems: saturable and reverse-saturable absorption.
E. V. García-Ramírez,Servando Almaguer-Valenzuela,Oswaldo Sanchez-Dena,Oscar Baldovino-Pantaleón,Jorge-Alejandro Reyes-Esqueda +4 more
TL;DR: The results were used to determine the irradiances to which NRs can be modified by photodegradation, and it was possible to determine that this effect results from structural changes in the samples, which are manifested through the behavior of nonlinear absorption and refraction curves.
Journal ArticleDOI
Analytical expressions for z-scan with arbitrary phase change in thin nonlocal nonlinear media
A. Balbuena Ortega,M. L. Arroyo Carrasco,M. M. Méndez Otero,E. Reynoso Lara,E. V. García Ramírez,M. D. Iturbe Castillo +5 more
TL;DR: Analytical expressions for the normalized transmittance of a thin material with simultaneous nonlocal nonlinear change in refraction and absorption with Gaussian decomposition method are reported.
Journal ArticleDOI
Generalizing the Z-scan theory for nonlocal nonlinear media
TL;DR: In this article, a non-local parameter in the nonlinear photoinduced phase shift between the impinging and outgoing Gaussian beams from a nonlocal nonlinear sample was introduced to describe the Z-scan results of samples with thicknesses much smaller than the Rayleigh length of the Gaussian beam.
References
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Journal ArticleDOI
Sensitive measurement of optical nonlinearities using a single beam
TL;DR: In this paper, a single-beam technique for measuring both the nonlinear refractive index and nonlinear absorption coefficient for a wide variety of materials is reported, including a comprehensive theoretical analysis.
Journal ArticleDOI
High-sensitivity, single-beam n(2) measurements.
TL;DR: A simple yet highly sensitive single-beam experimental technique for the determination of both the sign and magnitude of n(2), where the sample is moved along the z direction of a focused Gaussian beam while the repetitively pulsed laser energy is held fixed.
Journal ArticleDOI
Long‐Transient Effects in Lasers with Inserted Liquid Samples
TL;DR: In this paper, buildup and decay transients were observed when polar or nonpolar liquid cells were placed within the resonator of a helium-neon laser operating in the red at 6328 A.
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Laser-induced diffraction rings from a nematic-liquid-crystal film.
TL;DR: Multiple diffraction rings appear as a cw laser beam passes through a homeotropic nematic film and are shown to be the result of spatial self-phase modulation due to the laser-induced Freedericksz transition.
Journal ArticleDOI
Laser-induced thermal lens effect: a new theoretical model.
TL;DR: A theoretical model for the laser-induced thermal lens effect in weakly absorbing media is derived and some experimental results which support the validity of this approach are presented.