Yb:KY3F10 中的激光冷却：与 Yb:YLF 的比较,Optics Express

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Yb:KY3F10 中的激光冷却：与 Yb:YLF 的比较
Optics Express ( IF 3.2 ) Pub Date : 2022-12-13 , DOI: 10.1364/oe.472633
Stefan Püschel , Felix Mauerhoff , Christian Kraenkel , Hiroki Tanaka

反斯托克斯荧光激光冷却是一种实现全固态光学制冷机的技术。我们生长了 Yb ³⁺掺杂的 KY ₃ F ₁₀ (Yb:KYF) 晶体作为新型激光冷却介质，并将它们的冷却性能与 Yb ³⁺掺杂的 LiYF _{4进行了比较}(Yb:YLF) 晶体也在我们研究所生长。我们展示了与温度相关的吸收和发射截面以及 Yb:KYF 的荧光寿命，并计算了其用于激光冷却的材料品质因数。Yb:KYF 在低于 200 K 的温度下表现出比 Yb:YLF 更高的品质因数。这是因为，与 Yb:YLF 相比，从基态第二高斯塔克能级的激发跃迁最适合用于 Yb:KYF 的低温冷却。因此，它有可能实现低于液氮沸点的前所未有的低温。^{在这项工作中，我们观察到 Yb:KYF 的第一次激光冷却，并获得了 ∼10 −4} cm ⁻¹的背景吸收系数，这是 Yb ^{3+报道的最低值之一}-掺杂的氟化物晶体。一个简单的模型计算预测，我们的 Yb:KYF 和 Yb:YLF 晶体可以在高功率冷却装置中冷却至 ≈100 K。通过优化生长过程和使用更纯净的原材料，我们的 Yb:KYF 晶体仍有进一步改进的空间。

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Laser cooling in Yb:KY3F10: a comparison with Yb:YLF

Laser cooling by anti-Stokes fluorescence is a technology to realize all-solid-state optical cryocoolers. We grew Yb³⁺-doped KY₃F₁₀ (Yb:KYF) crystals as novel laser cooling media and compare their cooling performance to Yb³⁺-doped LiYF₄ (Yb:YLF) crystals also grown in our institute. We present temperature-dependent absorption and emission cross sections as well as the fluorescence lifetime of Yb:KYF, and calculate its material figure-of-merit for laser cooling. Yb:KYF exhibits a higher figure-of-merit than Yb:YLF at temperatures below 200 K. This is because, in contrast to Yb:YLF, the excitation transition from the second-highest Stark level of the ground state is best-suited for cryogenic cooling in Yb:KYF. Thus, it has the potential to achieve unprecedentedly low temperatures below the boiling point of liquid nitrogen. In this work, we observe the first laser cooling of Yb:KYF, and obtain a background absorption coefficient of ∼10⁻⁴ cm⁻¹, which is among the lowest ever reported for Yb³⁺-doped fluoride crystals. A simple model calculation predicts that our Yb:KYF and Yb:YLF crystals can potentially be cooled down to ≈100 K in a high-power cooling setup. Our Yb:KYF crystals still leave room for further improvement through the optimization of the growth process and the use of purer raw materials.

更新日期：2022-12-13

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