Optimum energy and duration in pulsed laser heating of organic materials

Year: 1982

Authors: Arecchi F.T., Castellini C., Mancini H., Tredicce J.

Autors Affiliation: Istituto Nazionale di Ottica, Largo E. Fermi 6, 50125 Firenze, Italy
Department of Physics, University of Firenze, 50125 Firenze, Italy
CEILAP, Buenos Aires, Argentina

Abstract: We have explored the minimum energy deposition necessary to drill a hole in a layer (or to cut a rod) of organic material by a pulsed CO2 laser operating at 10.6 μm. Applying equal amounts of energy over different time intervals gives rise to the appearance of two minima in an energy-time diagram. Current theoretical models for the melting process under laser irradiation yield a single minimum. Mass spectrometer tests of the vapors have localized dissociated molecular fractions strongly absorbing at 10.6 μm thus hinting at the possibility that the second valley may be due to a strong absorption of the vapors. This was indeed the case, as verified by working with the 9.4 μm emission band and with materials whose vapors are transparent in that region.

Journal/Review: OPTICS COMMUNICATIONS

Volume: 41 (4)      Pages from: 277  to: 281

KeyWords: pulsed CO2 laser
DOI: 10.1016/0030-4018(82)90430-8

Citations: 2
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