Imaging of transient surface acoustic waves by full-field photorefractive interferometry

Journal Article · Fri May 15 04:00:00 EDT 2015 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4921481· OSTI ID:22392491

Xiong, Jichuan ^[1]; Xu, Xiaodong ^[1]; Glorieux, Christ ^[2]; Matsuda, Osamu ^[3]; Cheng, Liping ^[1]

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1. Key Laboratory of Modern Acoustics, Nanjing University, Nanjing 210093 (China)
2. Soft Matter and Biophysics, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D, 3001 Heverlee (Belgium)
3. Division of Applied Physics, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628 (Japan)

A stroboscopic full-field imaging technique based on photorefractive interferometry for the visualization of rapidly changing surface displacement fields by using of a standard charge-coupled device (CCD) camera is presented. The photorefractive buildup of the space charge field during and after probe laser pulses is simulated numerically. The resulting anisotropic diffraction upon the refractive index grating and the interference between the polarization-rotated diffracted reference beam and the transmitted signal beam are modeled theoretically. The method is experimentally demonstrated by full-field imaging of the propagation of photoacoustically generated surface acoustic waves with a temporal resolution of nanoseconds. The surface acoustic wave propagation in a 23 mm × 17 mm area on an aluminum plate was visualized with 520 × 696 pixels of the CCD sensor, yielding a spatial resolution of 33 μm. The short pulse duration (8 ns) of the probe laser yields the capability of imaging SAWs with frequencies up to 60 MHz.

• OSTI ID: 22392491
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 5 Vol. 86; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ALUMINIUM
CHARGE-COUPLED DEVICES
DIFFRACTION
INTERFEROMETRY
LASERS
MHZ RANGE 01-100
PULSES
REFRACTIVE INDEX
SOUND WAVES
SPATIAL RESOLUTION
SURFACES