Analytical optimization of the ablation efficiency at normal and non-normal incidence for generic super Gaussian beam profiles

Arba-Mosquera, Samuel; Verma, Shwetabh

doi:10.1364/boe.4.001422

Cited by 12 publications

(7 citation statements)

References 37 publications

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“…Both M 2 and the SR are thus related to a "redistribution" of the (constant) energy in a different (wider) region (the spread). For a super-Gaussian profile, the following equation applies for the intensity [12]:…”

Section: Methodsmentioning

confidence: 99%

Simple Estimate of the Impact of M2 and Strehl Ratio on the Effective Focusable Spot Size

Arba-Mosquera,

Naubereit,

Sobutas

2024

Optics

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A simple method (first-order approximation) to determine the impact of M2 and the Strehl Ratio on the effective focusable spot size avoiding complex propagations of the beam wavefront is proposed. The model is based upon previous models and the definition of M2 and the Strehl Ratio in a simple manner. This work provides qualitative and quantitative estimates for the interplay of M2 and the Strehl Ratio on the effectively focusable spot size.

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Section: Methodsmentioning

confidence: 99%

Simple Estimate of the Impact of M2 and Strehl Ratio on the Effective Focusable Spot Size

Arba-Mosquera,

Naubereit,

Sobutas

2024

Optics

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“…The depth of ablation given by Eq. (6) can be modified for non-normal incidence as [36,37]: where θ is the incidence angle. The squared diameter for nonnormal incidence angle [36,37]:…”

Section: Laser Pulse Shape and Incidence Anglementioning

confidence: 99%

https://researchopenworld.com/laser-ablation-of-hard-tissues-a-review/#

2018

Sur Res Rep

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“…This represents a realistic limit commonly seen in laser vision correction. 25 We simulated the impact of other extreme values of spot energy (0.5 mJ and 1.4 mJ) on the metric roughness in ablation. Table 4 presents a comparison of the three tested energy settings.…”

Section: Impact Of Spot Energy and Spot Diametermentioning

confidence: 99%

“…25 Extending this model, the main purpose of this paper is to describe a rigorous and generic simulation model for simulating the sequential shot-by-shot ablation process based on a measured or modeled beam profile. Another aim is to test the impact of laser beam characteristics like spot energy, spot diameter, super Gaussian order, truncation radius, spot geometry, spot overlap, and lattice geometry on ablation smoothness, for both theoretically modeled super Gaussian beam profiles and measured intensity beam profiles acquired using a beam profiler camera.…”

mentioning

confidence: 99%

Optimum Laser Beam Characteristics for Achieving Smoother Ablations in Laser Vision Correction

Verma

Hesser

Arba-Mosquera

2017

Invest. Ophthalmol. Vis. Sci.

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PURPOSE. Controversial opinions exist regarding optimum laser beam characteristics for achieving smoother ablations in laser-based vision correction. The purpose of the study was to outline a rigorous simulation model for simulating shot-by-shot ablation process. The impact of laser beam characteristics like super Gaussian order, truncation radius, spot geometry, spot overlap, and lattice geometry were tested on ablation smoothness. METHODS.Given the super Gaussian order, the theoretical beam profile was determined following Lambert-Beer model. The intensity beam profile originating from an excimer laser was measured with a beam profiler camera. For both, the measured and theoretical beam profiles, two spot geometries (round and square spots) were considered, and two types of lattices (reticular and triangular) were simulated with varying spot overlaps and ablated material (cornea or polymethylmethacrylate [PMMA]). The roughness in ablation was determined by the root-mean-square per square root of layer depth. RESULTS.Truncating the beam profile increases the roughness in ablation, Gaussian profiles theoretically result in smoother ablations, round spot geometries produce lower roughness in ablation compared to square geometry, triangular lattices theoretically produce lower roughness in ablation compared to the reticular lattice, theoretically modeled beam profiles show lower roughness in ablation compared to the measured beam profile, and the simulated roughness in ablation on PMMA tends to be lower than on human cornea. For given input parameters, proper optimum parameters for minimizing the roughness have been found. CONCLUSIONS.Theoretically, the proposed model can be used for achieving smoothness with laser systems used for ablation processes at relatively low cost. This model may improve the quality of results and could be directly applied for improving postoperative surface quality.

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Analytical optimization of the ablation efficiency at normal and non-normal incidence for generic super Gaussian beam profiles

Cited by 12 publications

References 37 publications

Simple Estimate of the Impact of M2 and Strehl Ratio on the Effective Focusable Spot Size

Simple Estimate of the Impact of M2 and Strehl Ratio on the Effective Focusable Spot Size

https://researchopenworld.com/laser-ablation-of-hard-tissues-a-review/#

Optimum Laser Beam Characteristics for Achieving Smoother Ablations in Laser Vision Correction

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