Laser-based ultrasound detection using photorefractive quantum wells
作者:
I. Lahiri,
L. J. Pyrak-Nolte,
D. D. Nolte,
M. R. Melloch,
R. A. Kruger,
G. D. Bacher,
M. B. Klein,
期刊:
Applied Physics Letters
(AIP Available online 1998)
卷期:
Volume 73,
issue 8
页码: 1041-1043
ISSN:0003-6951
年代: 1998
DOI:10.1063/1.122078
出版商: AIP
数据来源: AIP
摘要:
We demonstrate a laser-based adaptive ultrasonic homodyne receiver using dynamic holography in AlGaAs/GaAs photorefractive multiple quantum wells. The dynamic hologram acts as an adaptive beamsplitter that compensates wavefront distortions in the presence of speckle and requires no path-length stabilization. The photorefractive quantum wells have the unique ability to achieve maximum linear homodyne detection regardless of the value of the photorefractive phase shift by tuning the excitonic spectral phase. We achieve a root mean square noise-equivalent surface displacement of6.7×10−7 Å(W/Hz)1/2.©1998 American Institute of Physics.
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