We experimentally investigate the iodine sublimation process using nonlinear spectroscopy induced by high-intensity femtosecond laser filamentation in air.It is demonstrated that femtosecond laser filament can induce clean characteristic fluorescence emission of sublimated iodine molecules in air.By monitoring the fluorescence of the molecular iodine at 341.6nm(the D→X~1Σ_g~+ transition),we observe by time-resolved measurements that the fluorescence signal varies as functions of the heating temperature and ...
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