Nonlinear absorption properties correlated with the surface and structural changes of ultra short pulse laser irradiated CR-39

Rafique, Muhammad Zeeshan; Bashir, Shazia; Ajami, Aliasghar; Husinsky, W.

doi:10.1007/s00339-010-5741-x

Cited by 17 publications

(9 citation statements)

References 33 publications

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“…2(a)-2(d) show the enlarged view of peripheral ablated region at higher magnification for various laser fluences of 0.86, 1, 1.13, and 1.27 J cm À2 . 20 The relaxation of compressive residual stresses due to transformation and aggregation of primary defects cause an increase of local volume and is responsible for the bump formation. 2.…”

Section: Resultsmentioning

confidence: 99%

“…Grains having pores and cavities across the grain boundaries are exhibited in Fig. 20 However, the size variation of the surface protrusions can be explained on the basis of variation in the energy deposition at various lattice sites. The possible reasons for the formation of this kind of microstructures (grains) are the re-crystallization of melted material in the laser irradiated area.…”

Section: Resultsmentioning

confidence: 99%

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Effect of excimer laser fluence on the surface structuring of Ti under vacuum condition

Umm-i-Kalsoom

Bashir

Ali

et al. 2014

Journal of Laser Applications

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Microstructure and growth mode at early growth stage of laser-ablated epitaxial Pb(Zr 0.52 Ti 0.48 ) O 3 films on a SrTiO 3 substrateThe effect of variation of excimer laser fluences on the surface structuring of titanium (Ti) targets has been investigated. The KrF excimer laser (k ¼ 248 nm, t ¼ 20 ns, repetition rate 20 Hz) has been employed for this purpose. The targets were irradiated for various laser fluences ranging from 0.86 J cm À2 to 1.27 J cm À2 under vacuum condition. Various diagnostic techniques like scanning electron microscope (SEM), atomic force microscope (AFM), and X-ray diffraction (XRD) have been utilized to investigate the surface topography and structural changes of laser ablated targets. SEM analysis reveals the formation of laser-induced periodic surface structures (LIPSS) at the central ablated region. The periodicity of LIPSS increases from 5 lm to 88 lm with the increase of fluence from 0.86 J cm À2 to 1.27 J cm À2 . The formation of grains is observed at the peripheral ablated region for all laser fluences. Reduction in grain size from 7.7 lm to 3.8 lm is observed with increasing fluence from minimum to maximum value. AFM analysis exhibits the growth of several numbers of bumps and protrusions on irradiated targets. The height of bumps is reduced from 100 nm to 40 nm with increasing fluence. XRD analysis shows that no new phases were formed under vacuum condition for all fluence values. However, an alteration in the peak intensity, crystallinity, and d-spacing for various diffraction planes of Ti has been observed after irradiation.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Effect of excimer laser fluence on the surface structuring of Ti under vacuum condition

Umm-i-Kalsoom

Bashir

Ali

et al. 2014

Journal of Laser Applications

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“…One of the most significance in the research field of photonics is refractive index modification of germanium-doped silica glass using 244 nm UV-laser irradiation as well as stud-ies on nonlinear refractive index change of glass by femtosecond laser irradiation [6]. It has been reported through time regarding the interaction of polymer materials with laser at different photoetching techniques by means of infrared nanosecond laser, femtosecond laser as well as excimer laser [7]. Nevertheless, several parameters in combination including, among others, the material as well as the laser pulse and energy affect the material removing processes [8].…”

Section: Introductionmentioning

confidence: 99%

Surface Modification of Polymer Materials Induced by Laser Irradiation

Zakaria¹

2016

Applications of Laser Ablation - Thin Film Deposition, Nanomaterial Synthesis and Surface Modification

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We report on the surface modification effects using allyl-diglycol CR39 polymer induced by laser irradiation at 157 nm F 2 laser (VUV) and 248 nm KrF laser. The motivation is to investigate the ablation effects on this polymer in optical waveguides application the ablation effects on this polymer in optical waveguides. Fabrication of waveguides has been observed using continuous wave (CW) at 244 nm argon ion laser. Ablation effects on the surface of this polymer have been characterized including ablation threshold at different wavelengths from the assorted depth of craters formed from UV pulsed laser. Application of this polymer in optical waveguide application is corroborated by the refractive index value on the CR39 channels that varied as fluences changed when using the continuous wave UV irradiation. A limit for upper fluence at the point where laser ablation originates on this polymer has also been determined.

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“…Previous studies of CR-39 through micro-Raman spectroscopy showed a decrease of peak intensity after irradiation with protons, ions, and femtosecond laser, indicating a change in the chemical structure of the polymer. 4,–8…”

Section: Introductionmentioning

confidence: 99%

Micro-Raman Spectroscopic Characterization of a CR-39 Detector

Pereira

Sáenz²,

Constantino

et al. 2013

Appl Spectrosc

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Characterization by micro-Raman spectroscopy of polymeric materials used as nuclear track detectors reveals physico-chemical and morphological information on the material's molecular structure. In this work, the nuclear track detector poly(allyl diglycol carbonate), or Columbia Resin 39 (CR-39), was characterized according to the fluence of alpha particles produced by a (226)Ra source and chemical etching time. Therefore, damage of the CR-39 chemical structure due to the alpha-particle interaction with the detector was analyzed at the molecular level. It was observed that the ionization and molecular excitation of the CR-39 after the irradiation process entail cleavage of chemical bonds and formation of latent track. In addition, after the chemical etching, there is also loss of polymer structure, leading to the decrease of the group density C-O-C (∼888 cm(-1)), CH=CH (∼960 cm(-1)), C-O (∼1110 cm(-1)), C-O-C (∼1240 cm(-1)), C-O (∼1290 cm(-1)), C=O (∼1741 cm(-1)), -CH2- (∼2910 cm(-1)), and the main band -CH2- (∼2950 cm(-1)). The analyses performed after irradiation and chemical etching led to a better understanding of the CR-39 molecular structure and better comprehension of the process of the formation of the track, which is related to chemical etching kinetics.

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Nonlinear absorption properties correlated with the surface and structural changes of ultra short pulse laser irradiated CR-39

Cited by 17 publications

References 33 publications

Effect of excimer laser fluence on the surface structuring of Ti under vacuum condition

Effect of excimer laser fluence on the surface structuring of Ti under vacuum condition

Surface Modification of Polymer Materials Induced by Laser Irradiation

Micro-Raman Spectroscopic Characterization of a CR-39 Detector

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