scholarly journals On the angular dependence of focused laser ablation by nanosecond pulses in solgel and polymer materials

2004 ◽  
Vol 84 (10) ◽  
pp. 1680-1682 ◽  
Author(s):  
D. S. George ◽  
A. Onischenko ◽  
A. S. Holmes
Keyword(s):  
Laser Ablation ◽  
Angular Dependence ◽  
Polymer Materials ◽  
Nanosecond Pulses

scholarly journals Femtosecond, picosecond, and nanosecond laser microablation: Laser plasma and crater investigation

2002 ◽  
Vol 20 (1) ◽  
pp. 67-72 ◽  
Author(s):  
A. SEMEROK ◽  
B. SALLÉ ◽  
J.-F. WAGNER ◽  
G. PETITE
Keyword(s):  
Laser Ablation ◽  
Theoretical Models ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Laser Beams ◽  
Limiting Factors ◽  
Nanosecond Laser ◽  
Ablation Efficiency ◽  
Nanosecond Pulses ◽  
Focused Laser Beams

Crater shapes and plasma plume expansion in the interaction of sharply focused laser beams (10 μm waist diameter, 60 fs–6 ns pulse duration) with metals in air at atmospheric pressure were studied. Laser ablation efficiencies and rates of plasma expansion were determined. The best ablation efficiency was observed with femtosecond laser pulses. It was found that for nanosecond pulses, the laser beam absorption, its scattering, and its reflection in plasma were the limiting factors for efficient laser ablation and precise material sampling with sharply focused laser beams. The experimental results obtained were analyzed with relation to different theoretical models of laser ablation.

Optical strength of polymer materials subjected to laser ablation-induced destruction

2009 ◽  
Vol 54 (5) ◽  
pp. 746-748 ◽  
Author(s):  
E. I. Voronina ◽  
V. P. Efremov ◽  
V. E. Privalov ◽  
P. V. Chartiy ◽  
V. G. Shemanin
Keyword(s):  
Laser Ablation ◽  
Polymer Materials ◽  
Optical Strength

Laser ablation thresholds of polymer materials studies

2004 ◽  
Author(s):  
Ellina I. Voronina ◽  
Vladimir P. Efremov ◽  
Vadim E. Privalov ◽  
Valery G. Shemanin
Keyword(s):  
Laser Ablation ◽  
Polymer Materials

Energy efficiency of femtosecond laser ablation of polymer materials

2012 ◽  
Vol 79 (1) ◽  
pp. 104-112 ◽  
Author(s):  
E. Yu. Loktionov ◽  
A. V. Ovchinnikov ◽  
Yu. Yu. Protasov ◽  
Yu. S. Protasov ◽  
D. S. Sitnikov
Keyword(s):  
Energy Efficiency ◽  
Laser Ablation ◽  
Femtosecond Laser ◽  
Femtosecond Laser Ablation ◽  
Polymer Materials

scholarly journals Compact high-power optical source for resonant infrared pulsed laser ablation and deposition of polymer materials

2006 ◽  
Vol 14 (25) ◽  
pp. 12302 ◽  
Author(s):  
V. Z. Kolev ◽  
M. W. Duering ◽  
B. Luther-Davies ◽  
A. V. Rode
Keyword(s):  
Laser Ablation ◽  
High Power ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Polymer Materials ◽  
Optical Source

Fabrication Process Development and Characterization of Polymethylhydrosiloxane (PMHS) for Surface-Modified Microfluidic Chips

2007 ◽  
Author(s):  
Mukund Vijay ◽  
Ehson Ghandehari ◽  
Michel Goedert ◽  
Sang-Joon J. Lee
Keyword(s):  
Laser Ablation ◽  
Soft Lithography ◽  
Process Development ◽  
High Surface ◽  
Volume Ratio ◽  
Fused Silica ◽  
Polymer Materials ◽  
Microfluidic Chips ◽  
Separation Processes

Microfluidic chips made of polymer materials such as polydimethylsiloxane (PDMS), polyimide, and cyclic olefin co-polymer have cost and manufacturing advantages over materials such as fused silica and borosilicate glass. While these materials have been extensively investigated, polymethylhydrosiloxane (PMHS) is an alternative that has a unique combination of properties in terms of UV transparency and potential for chemical surface modification. The present study investigates process development and characterization of PMHS as a new candidate material for microfluidic chip applications, in particular separation processes that would benefit from the ability to custom-engineer its surface conditions. This paper compares different approaches for fabricating microchannel features as well as options for enhancing the surface area of the channel walls. The fabrication methods include replication by casting over patterned molds, soft lithography casting, and material removal by laser ablation. Casting into solid form is achieved in 48-hours at 110 °C. Laser ablation is studied with energy dose varying from 2 mJ to 160 mJ per millimeter scanned, with channels approximately 100 microns wide occurring at 0.2 mJ/mm. Mechanical characterization is applied to quantify the hardness of cast PMHS, because fine-resolution features are limited by mold removal. PMHS samples have been measured to have a Shore A hardness of 46.2, similar to PDMS that is well-established in polymer microfluidic devices. Surface enhancement techniques including laser and plasma treatment are investigated for the prospective benefit of separation processes that require high surface-to-volume ratio. Spectrophotometry shows that PMHS exhibits transmittance even below 250 nm, which is favorable for sample analysis by UV absorption methods.

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