论文标题
超快声学中最佳声脉冲检测的综合干涉法
Conoscopic interferometry for optimal acoustic pulse detection in ultrafast acoustics
论文作者
论文摘要
综合干涉法是超快声学的有前途的检测技术。通过将探针光束通过双发性晶体聚焦，然后再通过偏振剂，圆锥形干扰雕刻了束的空间谱。这些模式在声波检测中的使用表明，对现有技术的检测灵敏度较高，例如反射测定法和梁失真检测。但是，提高灵敏度的物理起源尚不清楚。在这项工作中，我们提出了一个模型，描述了相对于四分之一波板方向和隔膜孔径的综合干涉仪的灵敏度行为，该模型已通过实验验证。使用该模型，我们优化了综合干涉仪的检测灵敏度。当将隔膜边缘放置在膜镜干扰模式的暗条纹上时，我们获得了检测的最大敏感性。在这项工作中研究的配置中，膜镜干涉测量法对声波的敏感性比梁失真检测更为敏感。
Conoscopic interferometry is a promising detection technique for ultrafast acoustics. By focusing a probe beam through a birefringent crystal before passing it through a polarizer, conoscopic interferences sculpt the spatial profile of the beam. The use of these patterns for acoustic wave detection revealed a higher detection sensitivity over existing techniques, such as reflectometry and beam distortion detection. However, the physical origin of the increased sensitivity is unknown. In this work, we present a model, describing the sensitivity behaviour of conoscopic interferometry with respect to the quarter-wave plate orientation and the diaphragm aperture, which is validated experimentally. Using the model, we optimize the detection sensitivity of conoscopic interferometry. We obtain a maximal sensitivity of detection when placing the diaphragm edge on the dark fringes of the conoscopic interference patterns. In the configurations studied in this work, conoscopic interferometry can be 8x more sensitive to acoustic waves than beam distortion detection.
