Abstract
Femtosecond (fs) laser pulses at variable delay times allowed us to track the fast non-radiative transitions between the manifold of highly excited \(\mathrm{M}_{\mathrm{Na}}^{**}\) states to the lower lying fluorescent \(\mathrm{M}_{\mathrm{Na}}^{*}\) state in CaF2. Two distinct \(\mathrm{M}_{\mathrm{Na}}^{**}\) states of the manifold at 3.16 eV (\(\mathrm{M}_{\mathrm{Na}2}^{**}\)) and 4.73 eV (\(\mathrm{M}_{\mathrm{Na}3}^{**}\)) were populated using the second (SH) and third harmonics (TH) of fs laser light at 785 nm. The population kinetics of the fluorescent \(\mathrm{M}_{\mathrm{Na}}^{*}\) state in the 2 eV excitation energy range was revealed by depleting its fluorescence centered at 740 nm using fundamental near infrared (NIR) fs laser pulses. The related time constants for \(\mathrm{M}_{\mathrm{Na}2,3}^{**}{\sim}{>} \mathrm{M}_{\mathrm{Na}}^{*}\) relaxation amounted to 1.0±0.14 ps and 3.0±0.3 ps upon SH and TH excitation, respectively.
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Karras, C., Mühlig, C., Paa, W. et al. Femtosecond relaxation kinetics of highly excited \(\mathrm{M}_{\mathrm{Na}}^{**}\) states in CaF2 at 3.2 eV and 4.7 eV. Appl. Phys. B 104, 17–20 (2011). https://doi.org/10.1007/s00340-011-4651-8
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DOI: https://doi.org/10.1007/s00340-011-4651-8