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Evolution of hole shape and size during short and ultrashort pulse laser deep drilling |
Optics Express, Vol. 20, Issue 24, pp. 27147-27154 (2012)
http://dx.doi.org/10.1364/OE.20.027147
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Abstract
A detailed study of the influence of the pulse duration, from the femtosecond to the nanosecond regime, on the evolution of the hole shape and depth during percussion drilling in silicon is presented. Real-time backlight imaging of the hole development is obtained for holes up to 2 mm deep with aspect ratios extending to 25:1. For low pulse energies, the hole-shape and drilling characteristics are similar for femtosecond, picoseconds and nanosecond regimes. At higher pulse energies, ns-pulses exhibit slower average drilling rates but eventually reach greater final depths. The shape of these holes is however dominated by branching and large internal cavities. For ps-pulses, a cylindrical shape is maintained with frequent small bulges on the side-walls. In contrast, fs-pulses cause only a limited number of imperfections on a tapered hole shape.
© 2012 OSA
OCIS Codes
(140.3390) Lasers and laser optics : Laser materials processing
(320.7090) Ultrafast optics : Ultrafast lasers
(350.3850) Other areas of optics : Materials processing
(150.5495) Machine vision : Process monitoring and control
ToC Category:
Laser Microfabrication
History
Original Manuscript: July 26, 2012
Revised Manuscript: October 12, 2012
Manuscript Accepted: October 12, 2012
Published: November 16, 2012
Citation
Sven Döring, John Szilagyi, Sören Richter, Felix Zimmermann, Martin Richardson, Andreas Tünnermann, and Stefan Nolte, "Evolution of hole shape and size during short and ultrashort pulse laser deep drilling," Opt. Express 20, 27147-27154 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-24-27147
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