简要介绍了激光超声和干涉仪检测原理,实现了一个激光超声实验.实验中,用调Q Nd:YAG固体激光器在超薄薄膜200 nm Al/Au/Ag中激励高频超声,用迈克尔逊干涉仪对超声进行了检测,对获得的信号进行傅里叶变换,获得了激励的振动频率.3种薄膜中产生的单一频率的超声振动分别为32.36、26.17和29.39 MHz.本工作对纳米薄膜的超声检测有一定的参考和借鉴作用.%The generation and detection of laser-based ultrasound were introduced. The experiment was performed. A beam of laser with pulse width of 7 ns produced by Q switch Nd:YAG was used to irradiate Al/Au/Ag metal films with thickness of 200 nm. The signal was detected by Michael interference method and transferred by Fourier method. The ultrasonic vibration frequencies excited in the sample are 32. 36, 26. 17 and 29. 39 MHz, respectively. The work is valuable to detect nano- and micro-meter films used to ICF experiment for the future.
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