Self-mixing interferometry used for instrumentations and measurements(invited)
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摘要:回顾了一种全新结构的干涉仪自混合干涉仪(SMI)的发展情况。SMI由于其在 器外部无需任何光学元件且应用范围广泛而倍受关注。SMI可用于测量与光路长度有关的一些量(如位移、小幅度振动、速度),也可用于测量弱光的回波(即回波损耗和隔离因子的测量)并可表征与介质相互作用特性相关的物理参数(如 线宽、相干长度以及因子等)。SMI是一种相干探测方法,其工作在靠近接收场的量子极限处,目前对散射目标物的最小探测幅值可达20 pmHz 甚至更高,使用角锥棱镜使其计数步长为半波长,在动态范围为2 m时其分辨率约为0.5 m。另外,SMI结构紧凑、易于现场安装且可用于MEMS测试、旋转机械振动测试和生物运行测试等各种实验。Abstract:This paper reviews the development of a new configuration of interferometry, Self-mixing Interferometry(SMI). SMI is attractive because it doesn't require any optical part external to the laser and can be employed in a variety of measurements, ranging from the traditional measurements related to optical path length like displacements, small-amplitude vibrations, velocity; to sensing of weak optical echoes, like return loss and isolation factor measurements; and also to a special feature for the interaction with the medium, measurements of physical parameters, like laser line width, coherence length, and the alfa factor. Because it is also a coherent detection scheme, the SMI operation is close to the quantum limit of received field and the minimum detectable amplitudes of 20 pmHz or better are currently achieved upon operation on diffusive targets, whereas a corner cube allows half-wavelength counting mode or 0.5 m resolution on a dynamic range up to 2 m. SMI has a compact setup, and is easy to deploy in the field and can interface a variety of experiments from MEMS testing to rotating machine vibration testing to pickup of biological motility as described in the paper.
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