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Incubation behaviour in triazenepolymer thin films upon near-infrared femtosecond laser pulse irradiation

AuthorsBonse, J. ; Wiggins, S. M.; Solís Céspedes, Javier ; Sturm, H.; Urech, L.; Wokaun, A.; Lippert, T.
Issue Date2007
PublisherInstitute of Physics Publishing
CitationJournal of Physics: Conference Series 59: 105-111 (2007)
AbstractThe effects of laser radiation induced by a sequence of ultrashort (130 fs), near-infrared (800 nm) Ti:sapphire laser pulses in ∼1 μm thick triazenepolymer films on glass substrates have been investigated by means of in-situ real-time reflectivity measurements featuring a ps-resolution streak camera and a ns-resolution photodiode set-up. The polymer films show incubation effects when each laser pulse in the sequence has a fluence below the single-pulse damage threshold. Non-damage conditions are maintained for several incubation pulses such that the reflectivity of the film shows a rapid decrease of up to 30% within 1 ns but subsequently recovers to its initial value on a ms timescale. Additional pulses lead to a permanent film damage. The critical number of laser pulses needed to generate a permanent damage of the film has been studied as a function of the laser fluence. Once damage is created, further laser pulses cause a partial removal of the film material from the glass substrate. Scanning force microscopy has been used to characterise ex-situ the irradiated surface areas. Based on these complementary measurements possible incubation mechanisms are discussed. © 2007 IOP Publishing Ltd.
Identifiersdoi: 10.1088/1742-6596/59/1/023
issn: 1742-6588
Appears in Collections:(CFMAC-IO) Artículos
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