Wei Heming, Krishnaswamy Sridhar
Opt Lett. 2017 Jul 1;42(13):2655-2658. doi: 10.1364/OL.42.002655.
Polymer micro-ring resonators fabricated by a direct laser writing technique are presented as sensors for ultrasound detection. The optical micro-ring resonator consists of a micro-ring waveguide that acts as a wavelength selective feedback mirror to an erbium-doped fiber-ring laser (FRL). The micro-ring resonator reflection spectrum determines the lasing frequencies of the FRL. Acoustic waves, which cause strain or deformation of the micro-ring resonator, lead to shifts of the resonance wavelength and thereby shifts in the FRL lasing spectrum. The spectral shifts are demodulated using an unbalanced Michelson interferometer. The experiments demonstrate that polymer micro-ring resonators integrated with a FRL can be used as adaptive high-frequency ultrasound detectors.
本文介绍了通过直接激光写入技术制造的聚合物微环谐振器作为超声检测传感器的应用。光学微环谐振器由一个微环波导组成，该波导充当掺铒光纤环激光器（FRL）的波长选择性反馈镜。微环谐振器的反射光谱决定了FRL的激射频率。引起微环谐振器应变或变形的声波会导致谐振波长的偏移，从而使FRL激射光谱发生偏移。使用不平衡迈克尔逊干涉仪对光谱偏移进行解调。实验表明，与FRL集成的聚合物微环谐振器可用作自适应高频超声探测器。
