Analytical study of flat-topped beam characterization using the thermal lens method in sample liquids

Nossir, N.; Dalil-Essakali, L.; Belafhal, A.

doi:10.1016/j.ijleo.2018.04.031

Cited by 7 publications

(4 citation statements)

References 27 publications

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“…Within the framework of the problem, the impact from the probe-beam waist position, confocal distance, and detector position on the signal was studied [ 68 ]. Independent studies on the influence of the excitation source (a Gaussian mode or a cylindrical incoherent light source) [ 64 , 69 ] and beam divergence on the thermal-lens signal are given; noise sources (light sources, sample, detector) are analyzed; the optimal ratio of the radius of the aperture pinhole to the beam radius for the maximum signal-to-noise ratio is proposed [ 64 ]. However, the values of systematic errors that arise during the adjustment and tuning of the optical components of the spectrometer and, most importantly, the quantitative effect of these errors on the measurement results are not stated in sufficient detail.…”

Section: Introductionmentioning

confidence: 99%

Accuracy of Measurements of Thermophysical Parameters by Dual-Beam Thermal-Lens Spectrometry

2023

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Thermal-lens spectrometry is a sensitive technique for determination of physicochemical properties and thermophysical parameters of various materials including heterogeneous systems and nanoparticles. In this paper, we consider the issues of the correctness (trueness) of measurements of the characteristic time of the thermal-lens effect and, thus, of the thermal diffusivity determined by dual-beam mode-mismatching thermal lensing. As sources of systematic errors, major factors—radiation sources, sample-cell and detector parameters, and general measurement parameters—are considered using several configurations of the thermal-lens setups, and their contributions are quantified or estimated. Furthermore, with aqueous ferroin and Sudan I in ethanol as inert colorants, the effects of the intermolecular distance of the absorbing substance on the correctness of finding the thermophysical parameters are considered. The recommendations for checking the operation of the thermal-lens setup to ensure the maximum accuracy are given. The results obtained help reducing the impact of each investigated factor on the value of systematic error and correctly measure the thermophysical parameters using thermal-lens spectrometry.

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Section: Introductionmentioning

confidence: 99%

Accuracy of Measurements of Thermophysical Parameters by Dual-Beam Thermal-Lens Spectrometry

2023

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“…Next, Sabaeian and Rezaei [136] have formulated an analytical model that took into account the HL top-hat profile and obtained results fully consistent with those given in [135]. The influence of the TL generated by a Gaussian beam on the propagation of a top-hat probe beam was studied numerically by Nossir et al [137]. They formulated analytical expressions for the squared radius, waist position and squared far-field divergence angle of the probe beam that passed through the thermal lens.…”

Section: The Effects Determining Thermal Lensing and The Correctness Of Its Theoretical Descriptionmentioning

confidence: 95%

Thermal lensing: outside of the lasing medium

Dobek

2022

Appl. Phys. B

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The thermal lens formed in a thermo-optical material as a result of its inhomogeneous heating, is a well-known phenomenon that has found widespread interest in the last decades, especially in the field of laser engineering and photo-thermal spectroscopy. In recent years, growing interest in the application of thermal lensing in different fields of optics and material studies has been observed. This review summarizes the latest efforts made by the scientific community to develop ways of using the phenomenon of thermal lensing. Its applications in spectroscopy, in laser beam formation and in imaging are described. The advantages and disadvantages of the thermal lensing in regard to these areas along with the potential future applications of the phenomenon are discussed.

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“…The electrical field distribution of a Flat-topped beam at the initial plane (z=0) can be represented in the cylindrical coordinates system as follows (Li 2002;Nossir et al 2018)…”

Section: Theoretical Description Of Flat-topped Beam Diffracted By a ...mentioning

confidence: 99%

“…Nowadays, laser beams with flat-topped profiles (Li 2002;Nossir et al 2018) have gained a great important due to their widespread use in material thermal processing. Some models have been developed in order to describe flat-topped beams such as Li's flat-topped-Gaussian beam and Li's flattened Gaussian beams (Khannous et al 2014;Khannous and Belafhal 2016;Ez-zariy and Belafhal 2016;Kinani et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Generation of optical vortices by flat-topped beam diffracted with a radial phase shift spiral zone plate

Nossir,

Dalil-Essakali,

Belafhal

2023

Preprint

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In this work, we investigate the generation of optical vortices by means of the so-called radial-phase shift spiral zone plate (RSSZP) from a flat-topped beam (FTB). Based on the process of the extended Huygens-Fresnel integral, an analytical formulation of the field distribution for the generated beam is developed. The evolution of the intensity distribution of the diffracted beam is numerically illustrated by studying the effects of some parameters. Moreover, it is established that the characteristics of the intensity of the generated beam is increased with the beam waist, on the contrary, this intensity is decreased by the augmentation of the beam order N. Furthermore, it is demonstrated that in the case of the topological charge equal to zero. The behavior of the beam is converted into a fundamental Gaussian. However, it is found that, for the topological charge superior to zero we have a vortex beam. In addition, it can be noted that the increase of the beam order leads the dark part size becomes large. In addition, as the shifting parameter is increased, the lobes appear larger. Finally, this research may be useful in different applications such as in optical switches and micromanipulation.

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Analytical study of flat-topped beam characterization using the thermal lens method in sample liquids

Cited by 7 publications

References 27 publications

Accuracy of Measurements of Thermophysical Parameters by Dual-Beam Thermal-Lens Spectrometry

Accuracy of Measurements of Thermophysical Parameters by Dual-Beam Thermal-Lens Spectrometry

Thermal lensing: outside of the lasing medium

Generation of optical vortices by flat-topped beam diffracted with a radial phase shift spiral zone plate

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