Hexagonal microcavities have been proposed for a wide range of applications including microlasers, levitated optomechanics, quantum information science, and biosensors that make use of both Fabry-Perot and whispering gallery mode cavity resonances. Photothermal heating impacts a number of optical and mechanical properties of hexagonal microcavities based on the temperature dependence of quantities such as radiative lifetime, Young’s modulus, optical index of refraction, and the corresponding wavelength of cavity mode resonances. This talk will present recent results in both analytical and numerical modeling of photothermal heating in hexagonal cavities inspired by recent optomechanical levitation experiments in both aqueous and high-vacuum environments.
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.
We report a new radiation-balanced laser design of a cladding-pumped double-clad fiber laser based on Yb-doped silica. The single-mode glass core has a high Yb doping level for lasing, whereas the inner cladding is cooling- grade silica glass with a low Yb concentration. Multimode pumping propagates along the inner cladding, scaling up the signal and extracting heat generated inside the core due to quantum defects and concentration quenching. Both analytical and numerical methods are used to calculate the electric-field and temperature distribution in the fiber. The core temperature is reduced significantly due to anti-Stokes cooling of the inner cladding.
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