利用光腔进行皮秒超声测量
Picosecond Ultrasonic Measurements Using an Optical Cavity
摘要：
详细分析了利用光学谐振腔增强皮秒超声信号的方法。在分布布拉格反射镜（DBR）和待研究的金属薄膜样品之间形成光学腔。Al和Cu膜的实验结果表明，声学信号的增强高达两个数量级，并与先前建立的模型的基础上的计算结果吻合良好。这种技术提供了一种有效的方法，用于检测材料中的声音与小的压电光学系数，并使其能够确定返回的声学回波的实际脉冲形状。
英文摘要：
A detailed analysis of the use of an optical cavity to enhance picosecond ultrasonic signals is presented. The optical cavity is formed between a distributed Bragg reflector (DBR) and the metal thin film samples to be studied. Experimental results for Al and Cu films show enhancement of acoustic signals by up to two orders of magnitude and are in good agreement with calculated results based on a previously established model. This technique provides an efficient method for detecting sound in materials with small piezo-optic coefficients and makes it possible to determine the actual pulse shape of the returning acoustic echoes.
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