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Multi-walled carbon nanotubes (MWCNTs) film have been analyzed by Raman spectroscopy to clarify the effect of a pulsed Nd: YAG laser heating. The MWCNTs film surface was flashed with the fundamental harmonic (Â¿ = 1064 nm) or the second harmonic (Â¿ = 532 nm) of a single pulse of Nd: YAG laser in the air. The dynamics of pulsed nanosecond laser heating process was simulated by the solution of the one-dimensional heat conduction equation. Raman spectroscopy of MWCNTs films before and after irradiation were measured. The intensity of the two characteristic Raman shifts ID (defect-mode) and IG (graphite-mode) was measured by the Raman spectroscopy. The maximum surface temperature was calculated and compared with the IG/ID ratio of MWCNTs film. The heating process by a pulsed Nd: YAG laser was further examined in the context of atmosphere (oxygen, ozone, nitrogen or partial vacuum).