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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 38, Iss. 11 — Jun. 1, 2013
  • pp: 1799–1801

Deep nonlinear ablation of silicon with a quasi-continuous wave fiber laser at 1070 nm

Karen X. Z. Yu, Logan G. Wright, Paul J. L. Webster, and James. M. Fraser  »View Author Affiliations


Optics Letters, Vol. 38, Issue 11, pp. 1799-1801 (2013)
http://dx.doi.org/10.1364/OL.38.001799


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Abstract

We achieve high aspect-ratio laser ablation of silicon with a strong nonlinear dependence on pulse duration while using a power density 106 times less than the threshold for typical multiphoton-mediated ablation. This is especially counter-intuitive as silicon is nominally transparent to the modulated continuous wave Yb:fiber laser used in the experiments. We perform time-domain finite-element simulations of thermal dynamics to investigate thermo-optical coupling and link the observed machining to an intensity-thresholded runaway thermo-optically nonlinear process. This effect, cascaded absorption, is qualitatively different from ablation observed using nanosecond-duration pulses and is general enough to potentially facilitate high-quality, high aspect-ratio, and economical processing of many materials.

© 2013 Optical Society of America

OCIS Codes
(140.3390) Lasers and laser optics : Laser materials processing
(140.3510) Lasers and laser optics : Lasers, fiber
(160.6000) Materials : Semiconductor materials
(190.0190) Nonlinear optics : Nonlinear optics
(190.4870) Nonlinear optics : Photothermal effects
(220.4000) Optical design and fabrication : Microstructure fabrication

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: October 24, 2012
Revised Manuscript: March 4, 2013
Manuscript Accepted: March 13, 2013
Published: May 20, 2013

Citation
Karen X. Z. Yu, Logan G. Wright, Paul J. L. Webster, and James. M. Fraser, "Deep nonlinear ablation of silicon with a quasi-continuous wave fiber laser at 1070 nm," Opt. Lett. 38, 1799-1801 (2013)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-38-11-1799

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