Direct measurement of polymer temperature during laser ablation using a molecular thermometer

I. Yin Sandy Lee, Xiaoning Wen, William A. Tolbert, Dana D. Dlott, Mark Doxtader, Dana R. Arnold

Research output: Contribution to journalArticlepeer-review


Photothermal laser ablation is studied using poly-(methyl methacrylate) films doped with a dye, IR-165, which functions as a molecular heater and thermometer. Direct optical measurements of temperature are performed on samples heated by 100 ns near-IR pulses at 1.064 μm, at rates dT/ dt≊5×109 deg/s. Below ablation threshold, the heat capacity measured by optical calorimetry is precisely the value obtained by conventional calorimetry. At ablation threshold, the peak surface temperature is T abl=600°C. The increase in heat capacity observed above threshold, together with the results of a conventional thermal analysis, is used to determine the weight fraction of material decomposed at ablation time χth=0.02. With increasing pulse energy, the fraction decomposed increases and a more forceful ablation is observed, but the surface temperature does not continue to increase past Tlim=715°C, which is determined to be the limiting temperature for thermal decomposition.

Original languageEnglish (US)
Pages (from-to)2440-2448
Number of pages9
JournalJournal of Applied Physics
Issue number6
StatePublished - 1992

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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