Submicron foaming in gelatine by nanosecond and femtosecond pulsed laser irradiation

Gaspard, S.; Oujja, M.; Nalda, R. de; Abrusci, C.; Catalina, F.; Bañares, Luis; Castillejo, Marta

doi:10.1016/j.apsusc.2007.01.083

Cited by 29 publications

(18 citation statements)

References 22 publications

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“…Laser induced chemical modifications on parchment have been reported in studies of excimer laser treatment above threshold at 308 nm [22] and were related with auto oxidation reactions occurring in irradiated areas. On materials of similar composition as gelatine and collagen, fs laser irradiation has been shown to induce chemical alterations as the ones reported here [20,23,24].…”

Section: Effects Of Laser Irradiationmentioning

confidence: 79%

Evaluation of femtosecond laser pulse irradiation of ancient parchment

Walczak

Oujja

Crespo-Arcá

et al. 2008

Applied Surface Science

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Section: Effects Of Laser Irradiationmentioning

confidence: 79%

Evaluation of femtosecond laser pulse irradiation of ancient parchment

Walczak

Oujja

Crespo-Arcá

et al. 2008

Applied Surface Science

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“…In gelatine, it has been observed that laser irradiation induces the photo-oxidation of the side chain of the aromatic amino acid tyrosine in dytirosine. 18,30 Similar effects could be responsible of a partial degradation of the material on the inner surface of the generated structures.…”

Section: -mentioning

confidence: 99%

“…15,16 In addition to bulk structuring, some examples of superficial fs laser processing of biopolymers and polymer-biopolymer blends have been reported. [17][18][19] A number of natural polymers, such as gelatine, chitosan, and others, are being employed as biomaterials as they offer the advantage of being similar to macromolecular substances, which the biological environment is prepared to recognize and to deal with metabolically. Useful properties, i.e., improved resistance to degradation by naturally occurring enzymes, can be obtained by blending natural and synthetic polymers.…”

mentioning

confidence: 99%

“…This biopolymer has served in previous laser ablation studies as model substance for soft biological tissue since it has absorption spectra and dielectric properties comparable to those of living material. 18,19 Chitosan is a linear polysaccharide composed of randomly distributed ␤-͑1-4͒-linked D-glucosamine ͑deacetylated unit͒ and N-acetyl-D-glucosamine ͑acetylated unit͒. It is a nontoxic, biodegradable, and biocompatible material, produced commercially from chitin, structural element in exoskeleton of crustaceans.…”

mentioning

confidence: 99%

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Three dimensional microstructuring of biopolymers by femtosecond laser irradiation

Oujja

Pérez

Fadeeva

et al. 2009

Applied Physics Letters

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A sequence of single femtosecond pulses is used to create a pattern of laser affected spots at increasing depths below the surface of transparent biopolymer samples. Materials with different water contents and mechanical strengths, gelatine, chitosan, synthetic polyvinyl pyrrolidone, and biopolymer-polymer blends, are irradiated near the edge of the sample with an amplified Titanium:Sapphire laser ͑800 nm͒ delivering 30 fs pulses through a 0.45 numerical aperture objective with energies of 100-3000 nJ. The micrometric modified region is observed by optical microscopy perpendicularly to irradiation. Self-focusing and optical aberration are major factors controlling morphology and size of the created spots.

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“…Femtosecond-pulsed laser machining of features with microscale resolution is feasible in various materials including polymer, dielectric, metal, glass, and even biological tissue [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Precise machining of disk shapes from thick metal substrates by femtosecond laser ablation

Park

Farson

2015

Int J Adv Manuf Technol

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Femtosecond-pulsed lasers have proven to be versatile for machining of microscale features in a variety of materials with minimal residual stress and heat-affected zone. However, machining of components from 200-μm-thick metal substrates by femtosecond laser ablation requires repetitive scanning of the laser beam focus along multiple adjacent paths numerous times to completely remove the part. In this study, optimization of multi-pass ablation parameters for efficient cutting and optimum final shape accuracy of disks of Stellite, aluminum, and stainless steel was investigated. The ablation depth of Stellite was measured with different pulse energies and groove widths, and 200 μm of diameter and thickness of Stellite disk were machined. The tapered cross-section of the disk was observed and increased pulse energy as the laser beam approached the bottom of the sample helped to minimize the taper angle of the sides of the disk. Moreover, the comparison of ablation depth in Stellite, aluminum, and stainless steel were conducted with various pulse energies and groove widths.

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Submicron foaming in gelatine by nanosecond and femtosecond pulsed laser irradiation

Cited by 29 publications

References 22 publications

Evaluation of femtosecond laser pulse irradiation of ancient parchment

Evaluation of femtosecond laser pulse irradiation of ancient parchment

Three dimensional microstructuring of biopolymers by femtosecond laser irradiation

Precise machining of disk shapes from thick metal substrates by femtosecond laser ablation

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