Researchers developed a new technique for laser cooling ytterbium-doped silica by 67 K from ambient temperature. This technique has the potential for solid-state optical refrigeration. The researchers achieved a net cooling of 67 K by pumping a 5 cm long, 1 mm diameter ytterbium-doped silica rod with a 100 W ytterbium fiber amplifier. The experiment was conducted in a vacuum and monitored with a non-contact differential luminescence thermometry method.
In optics and photonics, laser cooling is a technique that uses lasers to reduce the temperature of a material. This research presents a new technique for laser cooling ytterbium-doped silica, a glass type containing ytterbium ions. The technique achieved a net cooling of 67 K, a significant temperature reduction. This has the potential for solid-state optical refrigeration, which could be used in various applications, such as cooling lasers and other optical devices.
The researchers used a 100 W ytterbium fiber amplifier to pump a 5 cm long, 1 mm diameter ytterbium-doped silica rod. The experiment was conducted in a vacuum to minimize heat transfer from the surrounding environment. To monitor the rod’s temperature, a non-contact differential luminescence thermometry method was used.
This new technique for laser cooling ytterbium-doped silica is a promising development for solid-state optical refrigeration. However, further research is needed to improve the technique’s efficiency and develop practical applications.
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