Abstract
The H3 center in diamond has been shown to exhibit several promising characteristics for laser cooling applications including a neutral charge state, high radiative quantum yield, and efficient anti-Stokes photoluminescence. In this work, we show that upon excitation with a 532 nm laser, bulk diamond crystals doped with H3 centers emit efficient up-conversion photoluminescence and also show significantly reduced photothermal heating relative to crystals doped with NV centers. These results encourage future exploration of techniques for H3 enrichment in diamonds at high-pressure, high-temperature conditions for the simultaneous anti-Stokes fluorescence cooling and radiation balanced lasing in semiconductor materials.
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