Title :
A laser probing system for characterization of SAW propagation on LiNbO/sub 3/, LiTaO/sub 3/, and quartz
Author :
Holm, A. ; Weigel, R. ; Russer, Peter ; Ruile, W.
Author_Institution :
Inst. fur Hochfrequenztech., Tech. Univ. Munchen, Germany
Abstract :
A nondestructive high-resolution technique for the optical detection of the phase and amplitude of high-frequency surface acoustic wave (SAW) devices is presented. The setup incorporates a mode-locked ps-laser, harmonic mixing, and coherent detection. Dynamic range and minimum detectable surface displacement were 50 dB and 1 pm//spl radic/(Hz), respectively. The probing technique allows not only the measurement of the SAW field but also the precise direct determination of the phase velocity which is a fundamental design parameter in SAW technology. We present experimental results of the phase velocity of both SAW and Leaky SAW modes on quartz, LiNbO/sub 3/ and LiTaO/sub 3/ with an accuracy of up to 1.5.10/sup -5/. Our results agree very good with theory and other experiments.
Keywords :
acoustic materials; acoustic wave velocity measurement; acousto-optical effects; lithium compounds; measurement by laser beam; quartz; surface acoustic waves; LiNbO/sub 3/; LiTaO/sub 3/; SAW propagation; SiO/sub 2/; coherent detection; design parameter; dynamic range; field distribution; harmonic mixing; high-frequency surface acoustic wave device; laser probing system; leaky mode; mode-locked picosecond laser; nondestructive high-resolution technique; optical detection; phase velocity; quartz; Acoustic propagation; Acoustic signal detection; Laser mode locking; Optical detectors; Optical devices; Optical mixing; Optical propagation; Optical surface waves; Surface acoustic wave devices; Surface acoustic waves;
Conference_Titel :
Microwave Symposium Digest, 1996., IEEE MTT-S International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-3246-6
DOI :
10.1109/MWSYM.1996.512230
