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Please use this identifier to cite or link to this item: http://dyuthi.cusat.ac.in/purl/2501

Title: Evaluation of laser ablation threshold in polymer samples using pulsed photoacoustic technique
Authors: Ravi Kumar, A V
Padmaja, G
Radhakrishnan, P
Nampoori, V P N
Vallabhan, C P G
Technology
Keywords: Polymers
\damage threshold
palsed photoacoustics
Issue Date: Oct-1991
Publisher: Springer
Abstract: The acoustic signals generated in solids due to interaction with pulsed laser beam is used to determine the ablation threshold of bulk polymer samples of teflon (polytetrafluoroethylene) and nylon under the irradiation from a Q-switched Nd:YAG laser at 1.06µm wavelength. A suitably designed piezoelectric transducer is employed for the detection of photoacoustic (PA) signals generated in this process. It has been observed that an abrupt increase in the amplitude of the PA signal occurs at the ablation threshold. Also there exist distinct values for the threshold corresponding to different mechanisms operative in producing damages like surface morphology, bond breaking and melting processes at different laser energy densities.
URI: http://dyuthi.cusat.ac.in/purl/2501
ISSN: 0304-4289
Appears in Collections:Dr.C P Girijavallabhan

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