Multichannel, time-resolved picosecond laser ultrasound imaging and spectroscopy with custom complementary metal-oxide-semiconductor detector.
This paper presents a multichannel, time-resolved picosecond laser ultrasound system that uses a custom complementary metal-oxide-semiconductor linear array detector. This novel sensor allows parallel phase-sensitive detection of very low contrast modulated signals with performance in each channel comparable to that of a discrete photodiode and a lock-in amplifier. Application of the instrument is demonstrated by parallelizing spatial measurements to produce two-dimensional thickness maps on a layered sample, and spectroscopic parallelization is demonstrated by presenting the measured Brillouin oscillations from a gallium arsenide wafer. This paper demonstrates the significant advantages of our approach to pump probe systems, especially picosecond ultrasonics.
Smith
Richard J
RJ
Institute of Biophysics, Imaging and Optical Science, University of Nottingham, Nottinghamshire NG7 2RD, United Kingdom.
Light
Roger A
RA
Sharples
Steve D
SD
Johnston
Nicholas S
NS
Pitter
Mark C
MC
Somekh
Mike G
MG