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The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs.

Strathprints serves world leading Open Access research by the University of Strathclyde, including research by the Strathclyde Institute of Pharmacy and Biomedical Sciences (SIPBS), where research centres such as the Industrial Biotechnology Innovation Centre (IBioIC), the Cancer Research UK Formulation Unit, SeaBioTech and the Centre for Biophotonics are based.

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

Baum, A. and Scully, P.J. and Perrie, W. and Jones, D. and Issac, R. and Jaroszynski, D.A. (2008) Pulse-duration dependency of femtosecond laser refractive index modification in poly(methyl methacrylate). Optics Letters, 33 (7). pp. 651-653. ISSN 0146-9592

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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 threeand 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