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This work reports the dynamical thermal behavior of lasing microspheresplaced on a dielectric substrate while they are homogeneously heated-up by thetop-pump laser used to excite the active medium. The lasing modes are collectedin the far-field and their temporal spectral traces show characteristiclifetimes of about 2 ms. The latter values scale with the microsphere radiusand are independent of the pump power in the studied range. Finite-ElementMethod simulations reproduce the experimental results, revealing that thethermal dynamics is dominated by the heat dissipated towards the substratethrough the medium surrounding the contact point. The characteristic systemscale regarding thermal transport is of few hundreds of nanometers, thusenabling an effective toy model for investigating heat conduction innon-continuum gaseous media and near-field radiative energy transfer.

Far-field characterization of the thermal dynamics in lasing microspheres