A record output power of 16.1 W with a direct-bonded dual-SiC-heatspreader distributed Bragg reflector (DBR)-free active region at 10.5°C coolant temperature is reported. A comparison in laser performance confirms the dual-heatspreader DBR-free configuration dissipates heat more effectively than the single-heatspreader geometry.

In this work, thermal lens spectroscopy was performed simultaneously with photoluminescence experiments for determining the absolute external quantum efficiency (EQE) of luminescent materials. The procedure involved measurements of nonradiative (heat) and radiative (photon) emission rates after excitation of the material with a tunable laser. The main advantage of this combined methodology was that the amount of light absorbed by the sample was not required for EQE determination, which minimized the experimental error. In order to validate the methodology, the well-known Ce3+:YAG crystal was used for EQE determination, with the value obtained being in agreement with previous experiments. This shows that the method is a promising tool for accurate measurements of the EQE for materials with a single excited emission state.

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