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Demonstration of laser cooling in a novel all oxide GAYY silica glass
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DOI：10.1038/s41598-023-31912-1.png)
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Abstract
En 中文
We demonstrate laser induced cooling in ytterbium doped silica (SiO2) glass with alumina, yttria co-doping (GAYY-Aluminum: Yttrium: Ytterbium Glass) fabricated using the modified chemical vapour deposition (MCVD) technique. A maximum temperature reduction by - 0.9 K from room temperature (296 K) at atmospheric pressure was achieved using only 6.5 W of 1029 nm laser radiation. The developed fabrication process allows us to incorporate ytterbium at concentration of 4 x 10(26) ions/m(3) which is the highest value reported for laser cooling without clustering or lifetime shortening, as well as to reach a very low background absorptive loss of 10 dB/km. The numerical simulation of temperature change versus pump power well agrees with the observation and predicts, for the same conditions, a temperature reduction of 4 K from room temperature in a vacuum. This novel silica glass has a high potential for a vast number of applications in laser cooling such as radiation-balanced amplifiers and high-power lasers including fiber lasers.
Keywords:
OPTICAL-FIBER
QUENCHING ANALYSIS
ALUMINUM
YB3+
FLUORESCENCE
LANTHANUM
CERAMICS
CRYSTAL
ER3+
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