Abstract
The nanoscale measurement of temperature in the bulk of dielectrics initiated by a single ultrashort laser pulse was first investigated by black-body radiation. A structureless broad continuum emission has been recorded at an interval delay of 2ns with a temporal gate of 2ns and spectral resolution of about 0.137nm, which provides the highest temporal and spectral precision ever. The temporally resolved emission spectrum was proved to be black-body radiation in nature, and temperature was obtained by fitting the radiation with the Planckian formula. Pulse energy was varied from 110 to 270μJ at 600fs and a pulse duration of 0.83ns was also used. The temperature exhibited a small variation with an increasing pulse energy at 600fs. However, due to the energy transfer from heated electrons to lattice, the temperature was sharply increased at pulse duration of 0.83ns. It was estimated that heat accumulation started at 0.42-0.47MHz for a laser pulse at 600fs, while it was 0.25MHz for a laser pulse at 0.83ns.
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