Reconstructing the Spatial Parameters of a Laser Beam Using the Transport-of-Intensity Equation

Kovalev, M. S.; Gritsenko, I. V.; Stsepuro, Nikita; Nosov, P. A.; Krasin, George; Kudryashov, S. I.

doi:10.3390/s22051765

Cited by 9 publications

(7 citation statements)

References 21 publications

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“…Then, at the second stage, the wavefront radius of curvature R (z 2 ) is calculated by approximating the obtained phase values ϕ (z 2 ) of the laser beam with a hyperbolic dependence according to the following equations [18,19]: where z R is a Rayleigh length, w (z) is the laser beam radius at the level 1/e 2 and w 0 denotes the beam waist radius. At the final stage, based on the reconstructed spatial characteristics of the laser beam that passed through the optical lens, the refractive index of the lens is determined.…”

Section: Methods and Approachesmentioning

confidence: 99%

The optical refractometry using transport-of-intensity equation

Gritsenko¹,

Kovalev²,

Stsepuro³

et al. 2022

Laser Phys. Lett.

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A development of a method for measuring the refractive index of optical media based on the transport-of-intensity equation (TIE) is proposed. The method requires only a complementary metal-oxide semiconductor (CMOS) camera, which registers intensity distributions in several planes. The obtained intensity distributions are used to solve the TIE, known as a non-interferometric and deterministic method of measuring the phase of a light wave. Simple physical relations connecting the phase of the light wave that has passed through an optical medium and its refractive index allows to determine the latter. The results of the experiment confirm the applicability of the proposed method to the problems of optical refractometry.

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Section: Methods and Approachesmentioning

confidence: 99%

The optical refractometry using transport-of-intensity equation

Gritsenko¹,

Kovalev²,

Stsepuro³

et al. 2022

Laser Phys. Lett.

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“…If calculating the effective spot size of laser beam during cutting, the value can be estimated by plugging in half of the material thickness into variable ( z ) of Equation (). [ 116 ] This assumes fine focus is set to the center of the material. If fine focus were set on top of the material, the effective spot size would become the size of the beam waist.

$$z_{\text{R}} = \left[\right.

…”

Section: Nitinol Manufacturing Processesmentioning

confidence: 99%

“…The beam product parameter is a measure of how a beam compares to a theoretical gaussian beam distribution and is defined by Equation (1). [116] BPP…”

Section: Relevant Equationsmentioning

confidence: 99%

Nickel–Titanium Alloy Laser Micromachining: A Review of Nitinol Laser Processes and Optimization for High‐Speed Laser Cutting

Otto,

Vaseghi,

Davami

2024

Adv Eng Mater

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The nickel‐titanium (NiTi) alloy, “Nitinol”, has become a prominent name in the medical device industry amongst medical device manufacturers. The unique properties of the material, such as the shape memory effect and pseudoelasticity, have earned the material increasing popularity for new product innovations. Amongst the various manufacturing processes for metal alloys, laser micromachining has taken the lead for processing Nitinol‐based products. This literature review provides an analysis of the history and applications of Nitinol, an overview of the microstructure of the material, and a review of the current manufacturing methods for laser cutting medical‐grade Nitinol. A more in‐depth focus is placed on the realm of laser processing and the challenges associated with the manufacturing process. Ultrafast femtosecond pulse processing delivers promising results and quality for manufacturing Nitinol medical devices. However, there exists a need to investigate potential approaches to increase the cutting speed of the process to enhance throughput and stay competitive in a growing market due to the cutting speed being over 4‐times slower than long pulse cutting. Many tactics to address the problem are discussed, ranging from laser selection, processing parameters, and non‐traditional laser processing approaches.This article is protected by copyright. All rights reserved.

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“…Three-dimensional (3D) image visualization is a significant issue for many applications, such as unmanned autonomous vehicles, media content, defense, and so on [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ]. To visualize 3D images, various methods can be utilized, such as time of flight, stereoscopic imaging, holography, and integral imaging [ 1 , 9 , 10 , 11 ]. By utilizing incoherent light with a general camera, integral imaging [ 1 , 9 , 12 , 13 , 14 ] can be used.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Integral Imaging with Enhanced Lateral and Longitudinal Resolutions Using Multiple Pickup Positions

Lee

Cho²

2022

Sensors

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In this paper, we propose an enhancement of three-dimensional (3D) image visualization techniques by using different pickup plane reconstructions. In conventional 3D visualization techniques, synthetic aperture integral imaging (SAII) and volumetric computational reconstruction (VCR) can be utilized. However, due to the lack of image information and shifting pixels, it may be difficult to obtain better lateral and longitudinal resolutions of 3D images. Thus, we propose a new elemental image acquisition and computational reconstruction to improve both the lateral and longitudinal resolutions of 3D objects. To prove the feasibility of our proposed method, we present the performance metrics, such as mean squared error (MSE), peak signal-to-noise ratio (PSNR), structural similarity (SSIM), and peak-to-sidelobe ratio (PSR). Therefore, our method can improve both the lateral and longitudinal resolutions of 3D objects more than the conventional technique.

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Reconstructing the Spatial Parameters of a Laser Beam Using the Transport-of-Intensity Equation

Cited by 9 publications

References 21 publications

The optical refractometry using transport-of-intensity equation

The optical refractometry using transport-of-intensity equation

Nickel–Titanium Alloy Laser Micromachining: A Review of Nitinol Laser Processes and Optimization for High‐Speed Laser Cutting

Three-Dimensional Integral Imaging with Enhanced Lateral and Longitudinal Resolutions Using Multiple Pickup Positions

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