Morphological, elemental and hardness analysis of femtosecond laser irradiated Al targets

Umm-i-Kalsoom,; Ali, Nisar; Bashir, Shazia; Begum, Narjis; Rafique, Muhammad Zeeshan; Husinsky, W.

doi:10.1016/j.optlastec.2018.06.051

Cited by 11 publications

(8 citation statements)

References 46 publications

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“…Consequently, the pretreatment modifies the ablation characteristics, which can be understood based on the defect model. According to the defect model, the large entrapment of laser light by the defects on the target surface leads to increase of the local temperature . The enlarged orifice due to H 3 PO 4 pretreatment improves the laser light entrapment leading to enhancement of

italicAR

and

italicAE

.…”

Section: Resultsmentioning

confidence: 99%

“…The mechanism behind the formation of the deep and dual nature of the ablation profile on the H 3 PO 4 pretreated sample can be understood based on the heat accumulation model. According to the heat accumulation model, increasing the number of pulses at a focused spot adequately increases the temperature beyond a single pulse value, which in turn leads to ablation . Thus, in a pulse train, ablation depth is proportional to N eff .…”

Section: Resultsmentioning

confidence: 99%

“…The laser ablation mechanism is mainly based on the optical interaction of the laser with the surface structure and composition of target tissue . As a result, several groups have focused on an easier way to improve the laser ablation rate on dental hard tissues by varying the laser parameters.…”

Section: Introductionmentioning

confidence: 99%

“…A femtosecond laser (10 −15 seconds) is capable of delivering a high-intensity laser pulse within the thermal relaxation time, which results in cold ablation [7]. As a result, the femtosecond laser has plenty of advantages over the conventional laser (pulse duration > ns) such as preserving the adjacent tissue, crack and debris-free cold ablation, good surface morphology, open dentin tubules, absence of melting or thermal damage and no recast layer formation [3,[8][9][10][11]. Despite these advantages, the femtosecond laser is unable to replace conventional tools in the clinical setting due to the low ablation rate [4].…”

Section: Introductionmentioning

confidence: 99%

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Surface Processing: An Elegant Way to Enhance the Femtosecond Laser Ablation Rate and Ablation Efficiency on Human Teeth

et al. 2019

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Background and Objectives The employability of the non‐invasive femtosecond laser ablation technique for dental treatment has been severely limited by its low ablation rate despite the advantage of minimal tissue damage. The study explores a means of improving the femtosecond laser ablation rate and efficiency by physiochemical surface modification. Materials and Methods Surface modification of dental hard tissues has been carried out by food graded orthophosphoric acid and Carie care gel pretreatment. The laser ablation characteristics were studied by using a Ti:Sapphire laser (10 kHz, 10 mm/s, 100 fs, 800 nm) to ascertain the influence of pretreatment. Surface morphology and chemical composition were obtained by using an optical profiler, SEM and EDAX. Results The ablation threshold fluence decreased by almost one‐third whereas the ablation rate and ablation efficiency nearly tripled upon pretreatment. The microstructural and compositional analysis clearly reveals that surface modification and demineralization reduce the threshold fluence and increase the ablation rate by effective utilization of the laser beam energy. The pretreatment effect is more pronounced in orthophosphoric acid as compared with Carie care gel. Conclusions Physiochemical surface modification can be an efficient method to improve the laser ablation rate and ablation efficiency. Compositional analysis can be an elegant tool for pre‐surgery determination of laser ablation characteristics. Clinical Significances Pretreatment surface modification can be an effective way to overcome the limitation of the femtosecond laser for tooth preparation in the clinical setting by strongly enhancing the ablation rate. An enhanced ablation rate along with de nova prediction of ablation characteristics will enable the clinician to perform dental surgery in real time with minimal tissue damage. Lasers Surg. Med. © 2019 Wiley Periodicals, Inc.

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italicAR

and

italicAE

.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Surface Processing: An Elegant Way to Enhance the Femtosecond Laser Ablation Rate and Ablation Efficiency on Human Teeth

et al. 2019

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“…In addition, the variation of threshold fluence with % area of dentin tubules can also be explained with the help of defect model and heat accumulation model (Figure 4). According to the defect model, 26,35 the presents of defects on the target surface causes large entrapment of laser light. As a result, the focused laser beam is effectively utilized at the target surface, which in turn reduces the ablation threshold fluence.…”

Section: Discussionmentioning

confidence: 99%

Physiochemical characteristics: A robust tool to overcome teeth heterogeneity on predicting laser ablation profile

et al. 2020

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To avoid excessive tissue removal and collateral damage, the high‐power density laser is apt for dental surgery also need to have high precision. For high‐precision dental surgery with minimal tissue damage, the present work frames a method to predict laser ablation profile based on surface morphology and chemical composition of dentin. The surface morphology and chemical composition were studied on different dentin samples using scanning electron microscope (SEM) and Energy Dispersive X‐ray Analysis (EDAX), respectively. The key laser ablation parameters (ω0, Deff, and Fth) were determined by laser irradiation study using 800 nm, Ti:Sapphire femtosecond laser at processing condition of 100 fs, 10 kHz and 10 mm/s. The dentin samples show a strong linear correlation between physiochemical characteristics and laser ablation parameters. The surface morphology exhibits a negative linear correlation with threshold fluence, whereas the converse is true for chemical composition. The laser ablation parameters of a random dentin sample are derived from the knowledge of linearity data. From the obtained laser ablation parameters, the complete theoretical ablation profile is constructed and validated with experimental ablation profile. Even though the surface morphology of dentin shows high linearity, the concentration of Ca and P can be used as the most feasible probe in clinical settings. Furthermore, the laser ablation rate and ablation efficiency are predicted by the method to optimize the laser processing condition for any specific teeth. The versatility of the method overcomes the problem of heterogeneity on various teeth and simplifies the method of finding optimal laser processing condition for immaculate laser surgery.

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Femtosecond Laser Induced Modifications in Optical Properties and Surface Morphology of Copper Boron Oxide Thin Films

Ahmad

Siraj

Mushtaq

et al. 2021

Iran J Sci Technol Trans Sci

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Morphological, elemental and hardness analysis of femtosecond laser irradiated Al targets

Cited by 11 publications

References 46 publications

Surface Processing: An Elegant Way to Enhance the Femtosecond Laser Ablation Rate and Ablation Efficiency on Human Teeth

Surface Processing: An Elegant Way to Enhance the Femtosecond Laser Ablation Rate and Ablation Efficiency on Human Teeth

Physiochemical characteristics: A robust tool to overcome teeth heterogeneity on predicting laser ablation profile

Femtosecond Laser Induced Modifications in Optical Properties and Surface Morphology of Copper Boron Oxide Thin Films

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