Contrast increasing by third-order nonlinear image processing: a numerical study for microscopic rectangular objects

Boudebs, Georges; Chiş, Mihaela; Monteil, A.

doi:10.1016/s0030-4018(98)00037-6

Cited by 26 publications

(10 citation statements)

References 9 publications

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“…The diffracted field formation at the output of the setup shown in Figure 2 is described using a numerical model based on Fourier optics (see for details [ 21 , 22 , 23 , 24 ]).…”

Section: Resultsmentioning

confidence: 99%

Numerical Simulation of the Whole Thermal Lensing Process with Z-Scan-Based Methods Using Gaussian Beams

Boudebs

2021

Materials

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A general study of the diffracted far field due to thermal lens heating using Gaussian beams is presented. The numerical simulation considers the whole system, including both the optical and the thermal parameters. It is shown that the existing simplified relations found in the literature and used up to now only give the order of magnitude of the thermo-optical coefficients. More accurate, simplified formulas are derived to measure the induced thermal phase shift when working with Z-scan-based methods. Temperature estimation in absorbing media turn out to be more reliable whether using time-resolved or steady-state techniques. The extension of the calculation to the image formation in a 4f system is also addressed.

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“…The diffracted field formation at the output of the setup shown in Figure 2 is described using a numerical model based on Fourier optics (see for details [ 21 , 22 , 23 , 24 ]).…”

Section: Resultsmentioning

confidence: 99%

Numerical Simulation of the Whole Thermal Lensing Process with Z-Scan-Based Methods Using Gaussian Beams

Boudebs

2021

Materials

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“…1) can be described using a simple model based on Fourier optics (see for example Refs. [8], [9]). In this section we recall this approach.…”

Section: The Theoretical Modelmentioning

confidence: 99%

Why optical nonlinear characterization using imaging technique is a better choice?

Boudebs

Besse

Cassagne

et al. 2013

2013 15th International Conference on Transparent Optical Networks (ICTON)

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We show that the direct measurement of the beam radius in Z-scan experiments using a CCD camera at the output of a 4f-imaging system allows a higher sensitivity and a better accuracy than Baryscan. One of the advantages is to be insensitive to pointing instability of the pulsed laser because no hard aperture is employed as in the usual Z-scan. In addition, the numerical calculations involved here and the measurement of the beam radius are simplified since we do not measure the transmittance through an aperture and it is not subject to mathematical artifacts related to a normalization process, especially when the diffracted light is very low.

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“…We will recall briefly the theoretical adopted model described in details in [14]. It is assumed that scalar Fourier optics [15] is sufficient to describe image formation using 4f system in the low excitation regime.…”

Section: The Theoretical Modelmentioning

confidence: 99%

Nonlinear optical characterization in a degenerate multi-wave mixing configuration

Boudebs¹,

Fedus²

2009

SPIE Proceedings

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Using a 4-f imaging system for nonlinear optical measurements we deal with multi-wave mixing experiments. The complex degenerate four-wave mixing experimental setup is simplified in order to characterize nonlinear materials. Moreover, a generalization of the I-scan method is studied by considering one, two, three and four waves mixing experiments. The determination of the cubic optical nonlinearity is possible by providing quadratic relations that relate the nonlinear phase shift to the measured signal. The sensitivities of the measurements are compared systematically showing the same order of magnitude for all the studied configurations. Experimental and simulated images are presented here to validate our approach.

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Contrast increasing by third-order nonlinear image processing: a numerical study for microscopic rectangular objects

Cited by 26 publications

References 9 publications

Numerical Simulation of the Whole Thermal Lensing Process with Z-Scan-Based Methods Using Gaussian Beams

Numerical Simulation of the Whole Thermal Lensing Process with Z-Scan-Based Methods Using Gaussian Beams

Why optical nonlinear characterization using imaging technique is a better choice?

Nonlinear optical characterization in a degenerate multi-wave mixing configuration

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