Picosecond ultrasonic measurements using an optical cavity

被引：39
作者：
Li, Y. [1 ]
Miao, Q.
Nurmikko, A. V.
Maris, H. J.
机构：
[1] Brown Univ, Dept Phys, Providence, RI 02912 USA
来源：
JOURNAL OF APPLIED PHYSICS | 2009年 / 105卷 / 08期
关键词：
aluminium; copper; distributed Bragg reflectors; Fabry-Perot resonators; high-speed optical techniques; laser cavity resonators; measurement by laser beam; metallic thin films; photoacoustic effect; piezo-optical effects; ultrasonic variables measurement; INTERFEROMETRIC DETECTION; SCATTERING;
D O I：
10.1063/1.3095470
中图分类号：
O59 [应用物理学];
学科分类号：
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 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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