Refractive-index -一种带腔内多模干涉光纤传感器的传感射频梳
Refractive-index-sensing radio-frequency comb with intracavity multi-mode interference fibre sensor
摘要：
光学频率梳由于其齿状的离散光谱以及其固有的锁模性质和对频率标准的锁相控制而作为光学频率标尺引起了人们的注意。基于这一概念，迄今为止，它们的应用已经在光频计量和光程计量领域得到了证实。然而，如果光梳的效用可以通过利用光梳的新方面而进一步扩展到其基于光频尺的应用之外，这将导致光学计量和仪器的新发展。在这里，我们报告的光纤传感应用的基础上的光学和射频区域之间的相干频率链路的光梳，使高精度的液体样品的折射率测量的基础上的频率测量在射频区域。我们的技术编码的折射率变化的液体样品到一个射频梳由一个腔内多模干涉光纤传感器和腔光纤的波长色散的组合。然后，通过用频率计数器和频率标准测量射频梳的重复频率来读出折射率的变化。使用光梳作为光子射频转换器将导致在功能性光纤传感器和精确的射频测量的帮助下在高精度光纤传感中的新应用的发展。
英文摘要：
Optical frequency combs have attracted attention as optical frequency rulers due to their tooth-like discrete spectra together with their inherent mode-locking nature and phase-locking control to a frequency standard. Based on this concept, their applications until now have been demonstrated in the fields of optical frequency metrology and optical distance metrology. However, if the utility of optical combs can be further expanded beyond their optical-frequency-ruler-based application by exploiting new aspects of optical combs, this will lead to new developments in optical metrology and instrumentation. Here, we report a fibre sensing application of optical combs based on a coherent frequency link between the optical and radio-frequency regions, enabling high-precision refractive index measurement of a liquid sample based on frequency measurement in radio-frequency region. Our technique encodes a refractive index change of a liquid sample into a radio-frequency comb by a combination of an intracavity multi-mode-interference fibre sensor and wavelength dispersion of a cavity fibre. Then, the change in refractive index is read out by measuring the repetition frequency of the radio-frequency comb with a frequency counter and a frequency standard. Use of an optical comb as a photonic radio-frequency converter will lead to the development of new applications in high-precision fibre sensing with the help of functional fibre sensors and precise radio-frequency measurement.
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