15 July 2004 High-efficiency microstructuring of VUV window materials by laser-induced plasma-assisted ablation (LIPAA) with a KrF excimer laser
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Proceedings Volume 5339, Photon Processing in Microelectronics and Photonics III; (2004); doi: 10.1117/12.529451
Event: Lasers and Applications in Science and Engineering, 2004, San Jose, Ca, United States
Abstract
We report on the micro structuring of fused silica (a-SiO2) and calcium fluoride (CaF2) with a conventional KrF excimer laser (248 nm) by utilization of the effects in the laser-induced plasma-assisted ablation (LIPAA). Mask projection of the UV light is realized onto the rear (instead of the front) side of the UV transparent samples. The plasma generated from a metal target located behind the rear surface of the VUV window effectively assists in the ablation. In the case of fused silica, we obtain high-quality complex micro structures with structure depths even above 500 μm in aspect ratios of 1:5 and better. The ablation rate in fused silica can reach a level as high as 1 μm per pulse with this novel method, demonstrating a remarkable efficiency. While the ablation rate observed for CaF2 remains at 50 nm per pulse, the up to 100 μm deep micro structures demonstrate an excellent quality without signs of severe cracking or stress outside the mask projected area. This technique permits high-quality micro fabrication of bio-medical, electronic and opto-electronic devices based on oxides and fluorides by use of a conventional UV laser.
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Houssam Jaber, Alexander Binder, David Ashkenasi, "High-efficiency microstructuring of VUV window materials by laser-induced plasma-assisted ablation (LIPAA) with a KrF excimer laser", Proc. SPIE 5339, Photon Processing in Microelectronics and Photonics III, (15 July 2004); doi: 10.1117/12.529451; https://doi.org/10.1117/12.529451
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KEYWORDS
Silica

Laser ablation

Calcium

Excimer lasers

Fluorine

Metals

Ultraviolet radiation

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