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Laser refrigeration, alignment and rotation of levitated Yb3+:YLF nanocrystals

机译:Levitated YB3 +:YLF纳米晶体的激光制冷,对准和旋转

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摘要

The ability to cool and manipulate levitated nanoparticles in vacuum is a promising tool for exploring macroscopic quantum mechanics(1,2), precision measurements of forces(3) and non-equilibrium thermodynamics(4,5). The extreme isolation afforded by optical levitation offers a low-noise, undamped environment that has been used to measure zeptonewton forces(3) and radiation pressure shot noise(6), and to demonstrate centre-of-mass motion cooling(7,8). Ground-state cooling and the creation of macroscopic quantum superpositions are now within reach, but control of both the centre of mass and internal temperature is required. While cooling the centreof- mass motion to micro-kelvin temperatures has now been achieved, the internal temperature has remained at or above room temperature. Here, we realize a nanocryostat by refrigerating levitated Yb3+: YLF nanocrystals to 130 K using antiStokes fluorescence cooling, while simultaneously using the optical trapping field to align the crystal to maximize cooling.
机译:真空冷却和操纵悬浮纳米颗粒的能力是探索宏观量子力学(1,2),力量(3)和非平衡热力学(4,5)的精确测量的有前途的工具。光学悬浮提供的极端隔离提供低噪声,已用于测量Zeptonewton部队(3)和辐射压力射击噪声(6)的低噪声,并显示出质量中心运动冷却(7,8) 。地面冷却和宏观量子叠加的产生现在在达到范围内,但需要控制质量和内部温度的控制中心。现在已经实现了将Centreof-群众运动冷却到微海林温度的同时,内部温度在室温下或高于室温。这里,通过使用抗组织荧光冷却,通过制冷悬浮的YB3 +:YLF纳米晶体至130k来实现纳米晶溶膜,同时使用光学捕获场同时使晶体对准冷却。

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