Comment on “Nonlinear refraction measurements of materials using the moiré deflectometry”

Vaziri, Manouchehr

doi:10.1016/j.optcom.2014.09.017

Cited by 23 publications

(8 citation statements)

References 7 publications

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“…For morphological characterization of the fabricated CNPs by SEM and TEM analyses, NPs colloidal solution was dried on laboratory slides. As shown in Figure 3a-c, Theoretically, at high-intensity fields near the focal point of the converging lens, the sample behaves like a feeble lens whose focal length is proportional to the nonlinear refractive index n 2 of the sample and the position along the Z axis [60]. In the so-called closed-aperture Z-scan, the presence of the far-field aperture enables the setup to analyze the tiny distortions induced by this weak n 2 -dependent lens in the signal beam [61].…”

Section: Resultsmentioning

confidence: 99%

Large Optical Nonlinearity of the Activated Carbon Nanoparticles Prepared by Laser Ablation

et al. 2021

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Carbon nanoparticles (CNPs) with high porosity and great optical features can be used as a luminescent material. One year later, the same group investigated the NLO properties CNPs and boron-doped CNPs by 532 nm and 1064 nm laser excitations to uncover the underlying physical mechanisms in their NLO response. Hence, a facile approach, laser ablation technique, was employed for carbon nanoparticles (CNPs) synthesis from suspended activated carbon (AC). Morphological properties of the prepared CNPs were studied by transmission electron microscopy (TEM) and scanning electron microscopy (SEM). UV-Vis and fluorescence (FL) spectra were used to optical properties investigation of CNPs. The size distribution of nanoparticles was evaluated using dynamic light scattering (DLS). The nonlinear optical (NLO) coefficients of the synthesized CNPs were determined by the Z-scan method. As a result, strong reverse saturable absorption and self-defocusing effects were observed at the excitation wavelength of 442 nm laser irradiation. These effects were ascribed to the presence of delocalized π-electrons in AC CNPs. To the best of our knowledge, this is the first study investigating the NLO properties of the AC CNPs.

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Section: Resultsmentioning

confidence: 99%

Large Optical Nonlinearity of the Activated Carbon Nanoparticles Prepared by Laser Ablation

et al. 2021

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“…As the sample is brought closer to the focus, the beam irradiance increases, producing self-lensing in the sample. Self-lensing is a nonlinear optical phenomenon induced in the materials when it is exposed to an intense electromagnetic radiation, where the medium refractive index changes with the electric field intensity and, hence, it acts as a focusing lens [16,17] .A negative self-lensing (self-defocusing) before the focus reduces the diffraction, leading to a small beam at the aperture and a raise of the transmittance. When the sample crosses the focal plane to the right (+ z), the same self-defocusing effect will tend to raise the diffraction and minimize the aperture transmittance, as demonstrated in Figure -4 [20].…”

Section: Z-scan Experimentsmentioning

confidence: 99%

The Effects of Initial Laser Intensity on the Nonlinear Optical Properties of The Laser Dye DQOCI Doped Films Using Z-Scan Technique

Jaffar¹

2020

eijs

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This study is dedicated to investigate the effects of initial laser intensity on the nonlinear optical properties of the laser dye DQOCI dissolved in methanol with a concentration of 10 -5 M and doped with PMMA film. The properties were studied by using open and closed aperture Z-scan technique, with different levels of initial intensity (I0), excited by continuous diode solid-state laser at a wavelength of 532 nm. Three lenses of different focal lengths were employed to change the radius of the Gaussian laser beam and then change the initial intensity. For I0= 6.83 and 27.304 kWatt/cm2, the Z-scan curves show a saturation of absorption (SA) known as the negative type of nonlinearity, in which the absorption coefficient β 2 decreases and the transmittance increases with increasing the initial laser intensity. With I0 equal to 3.03 KWatt/cm2, the nonlinear absorption changes from SA to RSA, where the transmittances is reduced with the increase of intensity (z0) as analyzed by the theory of free carrier nonlinearities. The closed aperture z-scan shows a pre-focal transmittance minimum (valley) and a post focal transmittance maximum (peak) which reflects the z-scan signature of a positive nonlinearity (self-focusing) due to Kerr effect. Each of nonlinear refractive index (n2), nonlinear absorption coefficient (β 2), and third-order nonlinear optical susceptibility (χ3) are intensity-dependent.

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“…For measuring the real part of the nonlinear refractive index, the z-scan setup is used in its closed-aperture form, which is shown in figure 1. In this form, since the nonlinear material reacts like a weak z-dependent lens [20], the far-field aperture makes it possible to detect the small beam distortions in the original beam. Since the focusing power of this weak nonlinear lens depends on the nonlinear refractive index [20], it would be possible to extract its value by analyzing the z-dependent data acquired by the detector and by cautiously interpreting them using an appropriate theory [16].…”

Section: Z-scan Measurementsmentioning

confidence: 99%

“…In this form, since the nonlinear material reacts like a weak z-dependent lens [20], the far-field aperture makes it possible to detect the small beam distortions in the original beam. Since the focusing power of this weak nonlinear lens depends on the nonlinear refractive index [20], it would be possible to extract its value by analyzing the z-dependent data acquired by the detector and by cautiously interpreting them using an appropriate theory [16]. To measure the imaginary part of the nonlinear refractive index or the nonlinear absorption coefficient, the z-scan setup is used in its open-aperture form.…”

Section: Z-scan Measurementsmentioning

confidence: 99%

Nonlocal nonlinear optical response of graphene oxide-Au nanoparticles dispersed in different solvents

Fakhri

Vaziri

Jaleh

et al. 2015

J. Opt.

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In this paper, we report on the preparation of graphene oxide and graphene oxide-Au nanodispersions in various solvents, such as water, DMF (N,N-dimethylformamide) and NMP (N-methyl-2-pyrrolidone). Optical, structural and nonlinear optical properties of all the samples have been studied. The nonlinear optical properties have been measured using the z-scan technique. It is shown that the incorporation of Au nanoparticles can greatly improve the nonlinear optical properties of graphene oxide. More importantly, the fact is recognized that the media that surround the nonlinear sample can influence its nonlinear optical properties by their nonlocal action. The nonlocal z-scan theory has been used to estimate the role of the surrounding medium in changing the samples’ nonlinear responses.

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Comment on “Nonlinear refraction measurements of materials using the moiré deflectometry”

Cited by 23 publications

References 7 publications

Large Optical Nonlinearity of the Activated Carbon Nanoparticles Prepared by Laser Ablation

Large Optical Nonlinearity of the Activated Carbon Nanoparticles Prepared by Laser Ablation

The Effects of Initial Laser Intensity on the Nonlinear Optical Properties of The Laser Dye DQOCI Doped Films Using Z-Scan Technique

Nonlocal nonlinear optical response of graphene oxide-Au nanoparticles dispersed in different solvents

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