Mid-infrared ultra-high-Q resonators based on fluoride crystalline materials.
Mid-infrared ultra-high-Q resonators based on fluoride crystalline materials.
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DOI：
10.1038/ncomms13383
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发表时间：
2016-11-21
影响因子：
16.6
通讯作者：
Kippenberg, T. J.
中科院分区：
文献类型：
--
作者：
Lecaplain, C.;Javerzac-Galy, C.;Gorodetsky, M. L.;Kippenberg, T. J.
中红外高透明材料的缺乏一直是超灵敏分子传感器或腔基光谱应用发展的主要限制。窃窃廊模式微谐振器在近红外和可见光波段获得了超高质量(Q)因子共振。本文报道了使用抛光碱土金属氟化物晶体的中红外超高Q因子。采用未涂覆的硫族化合物锥形光纤作为中红外高理想耦合器，通过腔衰落技术研究了BaF2、CaF2、MgF2和SrF2微谐振器的损耗。通过研究Q因子的温度依赖性，我们发现MgF2受到多声子吸收的限制。相比之下，SrF2和BaF2中较低的多声子吸收导致4.5 μm处的超高Q因子。这些值对应于光学精细度，这是迄今为止任何类型的中红外谐振器所达到的最高值。利用透明微谐振器，可以在中红外范围内进行高灵敏度的痕量气体检测。在这里，作者使用锥形硫族纤维直接测量由氟化物晶体材料制成的微谐振器的必要超高质量因子。
The unavailability of highly transparent materials in the mid-infrared has been the main limitation in the development of ultra-sensitive molecular sensors or cavity-based spectroscopy applications. Whispering gallery mode microresonators have attained ultra-high-quality (Q) factor resonances in the near-infrared and visible. Here we report ultra-high Q factors in the mid-infrared using polished alkaline earth metal fluoride crystals. Using an uncoated chalcogenide tapered fibre as a high-ideality coupler in the mid-infrared, we study via cavity ringdown technique the losses of BaF2, CaF2, MgF2 and SrF2 microresonators. We show that MgF2 is limited by multiphonon absorption by studying the temperature dependence of the Q factor. In contrast, in SrF2 and BaF2 the lower multiphonon absorption leads to ultra-high Q factors at 4.5 μm. These values correspond to an optical finesse of , the highest value achieved for any type of mid-infrared resonator to date. Highly sensitive trace-gas detection is possible in the mid-infrared range with transparent microresonators. Here, the authors directly measure the necessary ultra-high quality factors of microresonators made from fluoride crystal materials using a tapered chalcogenide fibre.
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