Infrared and Laser Engineering, Volume. 47, Issue 12, 1206005(2018)
Thermal load management of laser cooling of Yb3+: LuLiF4 crystal
In order to study the thermal load management mechanism of Yb3+: LuLiF4 crystal in anti-Stokes fluorescence process, laser cooling experiment based on standard pressure (1.0×105 Pa) and high vacuum(2.5×10-3 Pa) states were carried out. The 5 mol% doped sample was supported by two optical fibers, and was placed in chamber with different vacuum states. The sample was excited via a 1 020 nm, 3 W laser. A temperature drop from room temperature of the sample was about ΔT≈12 K under standard pressure, and ΔT≈26 K under high vacuum. As for standard pressure state, thermal convection load of air was about 11.23 mW, thermal conduction load of the fibers was about 0.03 mW, thermal radiation load of the chamber was about 4.8 mW. As for high vacuum state, convection load of air was about 0.03 mW, conduction load of the fibers was about 0.07 mW, radiation load of the chamber was about 10.4 mW. As experimental results show, with the decrease of the pressure of the chamber from -105 Pa to -103 Pa, convection load of air is almost negligible, radiation load of the chamber becomes the most important thermal load of the refrigeration sample.
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Luo Hao, Zhong Biao, Lei Yongqing, Shi Yanling, Yin Jianping1. Thermal load management of laser cooling of Yb3+: LuLiF4 crystal[J]. Infrared and Laser Engineering, 2018, 47(12): 1206005
Category: 激光技术及应用
Received: Jul. 11, 2018
Accepted: Aug. 15, 2018
Published Online: Jan. 10, 2019
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