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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 33, Iss. 7 — Apr. 1, 2008
  • pp: 651–653

Pulse-duration dependency of femtosecond laser refractive index modification in poly(methyl methacrylate)

Alexandra Baum, Patricia J. Scully, Walter Perrie, David Jones, Riju Issac, and Dino A. Jaroszynski  »View Author Affiliations


Optics Letters, Vol. 33, Issue 7, pp. 651-653 (2008)
http://dx.doi.org/10.1364/OL.33.000651


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Abstract

Refractive index modification of pure poly(methyl methacrylate) (PMMA) is investigated as a function of pulse duration using femtosecond lasers at 800 and 387 nm wavelength. It is observed that at 800 nm , the refractive index is modified more efficiently as the pulse duration decreases below 100 fs , whereas at 387 nm , efficient index modification is accomplished with longer, 180 fs pulses. Results suggest that three- and two-photon absorption is responsible for modification of pure PMMA at 800 nm and 387 nm , respectively. Repeated irradiation with short pulses of low laser fluence allows control of the photomodification via incubation, thus reducing bulk damage.

© 2008 Optical Society of America

OCIS Codes
(160.5470) Materials : Polymers
(320.2250) Ultrafast optics : Femtosecond phenomena
(350.3390) Other areas of optics : Laser materials processing

ToC Category:
Ultrafast Optics

History
Original Manuscript: October 9, 2007
Revised Manuscript: February 8, 2008
Manuscript Accepted: February 14, 2008
Published: March 21, 2008

Citation
Alexandra Baum, Patricia J. Scully, Walter Perrie, David Jones, Riju Issac, and Dino A. Jaroszynski, "Pulse-duration dependency of femtosecond laser refractive index modification in poly(methyl methacrylate)," Opt. Lett. 33, 651-653 (2008)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-33-7-651


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