A small mode volume tunable microcavity: Development and characterization
A small mode volume tunable microcavity: Development and characterization
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DOI：
10.1063/1.4896415
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发表时间：
2014-09-22
影响因子：
4
通讯作者：
Warburton, Richard J.
中科院分区：
文献类型：
--
作者：
Greuter, Lukas;Starosielec, Sebastian;Warburton, Richard J.
本文报道了一种空间和光谱可调谐的高精细度和λ-波长尺度模体积的法布里-珀罗型微腔的实现。这些性质在光力学、量子传感和最重要的腔量子电动力学等领域都具有重要的应用价值。主要设计特点是一个小型化的凹面镜，具有原子级光滑的表面和曲率半径低至10 μ m的CO2激光烧蚀熔融石英。我们展示了良好的模式匹配的聚焦激光束的微腔模式，并确认从谐振腔模式的频率，有效的光学半径匹配的物理半径。有了这些小半径，我们证明波长大小的光束腰。我们还表明，微腔是足够刚性的实际应用：在低温恒温器在4 K，均方根微腔长度波动低于5 pm。(C)2014 AIP Publishing LLC.
We report the realization of a spatially and spectrally tunable air-gap Fabry-Perot type microcavity of high finesse and cubic-wavelength-scale mode volume. These properties are attractive in the fields of opto-mechanics, quantum sensing, and foremost cavity quantum electrodynamics. The major design feature is a miniaturized concave mirror with atomically smooth surface and radius of curvature as low as 10 mu m produced by CO2 laser ablation of fused silica. We demonstrate excellent mode-matching of a focussed laser beam to the microcavity mode and confirm from the frequencies of the resonator modes that the effective optical radius matches the physical radius. With these small radii, we demonstrate wavelength-size beam waists. We also show that the microcavity is sufficiently rigid for practical applications: in a cryostat at 4 K, the root-mean-square microcavity length fluctuations are below 5 pm. (C) 2014 AIP Publishing LLC.