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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 38, Iss. 23 — Dec. 1, 2013
  • pp: 4939–4942

Shape control of elemental distributions inside a glass by simultaneous femtosecond laser irradiation at multiple spots

Masaaki Sakakura, Torataro Kurita, Masahiro Shimizu, Kouhei Yoshimura, Yasuhiko Shimotsuma, Naoaki Fukuda, Kazuyuki Hirao, and Kiyotaka Miura  »View Author Affiliations


Optics Letters, Vol. 38, Issue 23, pp. 4939-4942 (2013)
http://dx.doi.org/10.1364/OL.38.004939


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Abstract

The spatial distributions of elements in a glass can be modulated by irradiation with high repetition rate femtosecond laser pulses. However, the shape of the distribution is restricted to being axially symmetric about the laser beam axis due to the isotropic diffusion of photo-thermal energy. In this study, we describe a method to control the shape of the elemental distribution more flexibly by simultaneous irradiation at multiple spots using a spatial light modulator. The accumulation of thermal energy was induced by focusing 250 kHz fs laser pulses at a single spot inside an alumino–borosilicate glass, and the transient temperature distribution was modulated by focusing 1 kHz laser pulses at four spots in the same glass. The resulting modification was square-shaped. A simulation of the mean diffusion length of molten glass demonstrated that the transient diffusion of elements under heat accumulation and repeated temperature elevation at multiple spots caused the square shape of the distribution.

© 2013 Optical Society of America

OCIS Codes
(140.3390) Lasers and laser optics : Laser materials processing
(140.6810) Lasers and laser optics : Thermal effects
(230.6120) Optical devices : Spatial light modulators
(320.2250) Ultrafast optics : Femtosecond phenomena

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: August 21, 2013
Revised Manuscript: October 18, 2013
Manuscript Accepted: October 21, 2013
Published: November 19, 2013

Citation
Masaaki Sakakura, Torataro Kurita, Masahiro Shimizu, Kouhei Yoshimura, Yasuhiko Shimotsuma, Naoaki Fukuda, Kazuyuki Hirao, and Kiyotaka Miura, "Shape control of elemental distributions inside a glass by simultaneous femtosecond laser irradiation at multiple spots," Opt. Lett. 38, 4939-4942 (2013)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-38-23-4939

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