TITLE

Effective broadband detection of nanometer laser-induced ultrasonic surface displacements by CdTe:V adaptive photoelectromotive force detector

AUTHOR(S)
Stepanov, S.; Rodriguez, P.; Trivedi, S.; Wang, C.-C.
PUB. DATE
January 2004
SOURCE
Applied Physics Letters;1/19/2004, Vol. 84 Issue 3, p446
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Results of experiments studying the utilization of adaptive CdTe:V photoelectromotive force (photo-EMF) detector for high-sensitivity broadband detection of laser-generated ultrasound are presented. Unlike widely used GaAs photo-EMF detectors, the devices used here demonstrate no significant electron-hole competition. This ensures effective detection of ≅1 nm surface displacements with ≅0.1 mW of the signal beam power in 10 MHz detection frequency band, even in simple transverse detector configuration. For the wavelength of λ=852 nm used in the experiments, the dielectric cutoff frequency of a typical device was approaching 1 MHz. This, in principle, enables monitoring of as-processed objects moving with in-plane velocities up to 10 m/s. © 2004 American Institute of Physics.
ACCESSION #
11941919

 

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