Abstract
Phonon emission is an energy-conversion efficiency loss in photonic transition processes. Phonon recycling by the anti-Stokes cooling results in a lower operating temperature. Transmitted optical phonons cross heterogeneous boundary and the upconverted acoustic phonons contribute to higher occupancy of the optical phonon and increase the second-order transition rate. Optimization of phonon spectra makes upconversion favorable. We present theoretical study and quantitative efficiency results for phonon recycling in Yb3+ doped yttria alumina garnet lasing layer and its adjacent Yb3+:ZrF2 cooling layers and examine the thermodynamic limits. It is predicted that 30% of emitted phonons are recycled and further improvement is possible.
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