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Abstract:
We theoretically study prospects and limitations of a new route towards macroscopic scale laser
refrigeration based on exciplex-mediated frequency up-conversion in gas filled hollow-core fibres.
Using proven quantum optical rate equations we model the dynamics of a dopant-buffer gas mixture
filling an optically pumped waveguide. In the particular example of alkali-noble gas mixtures,
recent high pressure gas cell setup experiments have shown that efficient kinetic energy extraction
cycles appear via the creation of transient exciplex excited electronic bound states. The cooling
cycle consists of absorption of lower energy laser photons during collisions followed by blue-shifted
spontaneous emission on the atomic line of the alkali atoms. For any arbitrary dopant-buffer gas
mixture, we derive scaling laws for cooling power, cooling rates and temperature drops with varying
input laser power, dopant and buffer gas concentration, fibre geometry and particularities of the
exciplex ground and excited state potential landscapes.
