Jarschel P F, Magalhaes L S, Aldaya I, Florez O, Dainese P
Opt Lett. 2018 Mar 1;43(5):995-998. doi: 10.1364/OL.43.000995.
We propose a fast and non-destructive method to characterize the absolute diameter and uniformity of micrometer-scale fiber tapers using a pump and probe forward Brillouin scattering setup. The fundamental torsional-radial acoustic mode supported by the wire is excited using a pulsed pump laser and oscillates at a frequency that is inversely proportional to the taper waist diameter. This standing time-varying torsional-radial wave induces polarization modulation on a probe signal, whose spectrum structure reveals the sample diameter and its non-uniformity. By comparing our results with measurements using scanning-electron microscopy, a relative deviation of 1% or less was demonstrated, and diameter non-uniformity of less than 0.5% could be detected.
我们提出了一种快速且无损的方法，利用泵浦和探测前向布里渊散射装置来表征微米级光纤锥的绝对直径和均匀性。使用脉冲泵浦激光器激发由金属丝支持的基本扭转 - 径向声学模式，该模式以与锥腰直径成反比的频率振荡。这种时变的驻波扭转 - 径向波在探测信号上引起偏振调制，其频谱结构揭示了样品直径及其不均匀性。通过将我们的结果与使用扫描电子显微镜的测量结果进行比较，证明相对偏差在1%或更小，并且可以检测到小于0.5%的直径不均匀性。
