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    • Keywords


      Polymers; damage threshold; pulsed photoacoustics

    • 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.

    • Author Affiliations


      A V Ravi Kumar1 G Padmaja1 P Radhakrishnan1 V P N Nampoori1 C P G Vallabhan1

      1. Laser Division, Department of Physics, Cochin University of Science and Technology, Cochin - 682 022, India
    • Dates

  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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