Reduction of heating rate in a microfabricated ion trap by pulsed-laser cleaning
Reduction of heating rate in a microfabricated ion trap by pulsed-laser cleaning
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DOI：
10.1088/1367-2630/13/12/123023
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发表时间：
2011-10
影响因子：
3.3
通讯作者：
D. Allcock;L. Guidoni;L. Guidoni;T. Harty;C. Ballance;M. Blain;A. Steane;D. Lucas
中科院分区：
文献类型：
--
作者：
D. Allcock;L. Guidoni;L. Guidoni;T. Harty;C. Ballance;M. Blain;A. Steane;D. Lucas
已尝试使用来自 355 nm 三倍 Nd:YAG 激光器的 ns 脉冲对平面微制造离子阱中的电极进行激光清洁。通过测量单个 40Ca+ 捕获离子的加热速率与其长期频率 ωz 的函数关系，测试了激光脉冲在多个能量密度水平下的效果。观察到电场噪声频谱密度降低了约 50%，并且还注意到频率依赖性的变化。这是第一个报道的实验，其中通过去除源来减少“异常加热”现象，而不是通过低温冷却来减少其热驱动。这项技术可能为更好地控制离子微阱中的电极表面质量开辟道路。
Laser cleaning of the electrodes in a planar micro-fabricated ion trap has been attempted using ns pulses from a tripled Nd:YAG laser at 355 nm. The effect of the laser pulses at several energy density levels has been tested by measuring the heating rate of a single 40Ca+ trapped ion as a function of its secular frequency ωz. A reduction of the electric-field noise spectral density by ∼50% has been observed and a change in the frequency dependence also noticed. This is the first reported experiment where the ‘anomalous heating’ phenomenon has been reduced by removing the source as opposed to reducing its thermal driving by cryogenic cooling. This technique may open up the way to better control of the electrode surface quality in ion microtraps.