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Proceedings Paper

Wavelength agile photoacoustic microscopy with a photonic crystal fiber supercontinuum source
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Paper Abstract

Spectroscopic photoacoustic microscopy (PAM) requires a pulsed nanosecond laser with tunable wavelength, but such lasers are expensive and have poor wavelength switching speed. We are developing a rapidly tunable system based on a high repetition rate supercontinuum source. A supercontinuum is produced by propagating 0.6 ns duration pulses from an 7.5 kHz Q-switched Nd:YAG microchip laser through 7 meters of photonic crystal fiber (PCF). Wavelength selection is achieved with a rapidly tunable prism-based monochromator, where an actuator-controlled mask selects the desired wavelength band. Ten different wavelength bands (570 to 930 nm) are acquired in less than 1 second for each image pixel. Each wavelength has a bandwidth of 40 nm. The PAM system employs optical focusing of the excitation beam and detection with a 25 MHz spherically focused f/3 transducer. Multiwavelength imaging is tested on phantoms with different color inks. The inks were correctly identified by processing the multiwavelength images with a linear discriminant analysis. A major advantage of our tunable source is the high repetition rate and rapid access to widely separated wavelengths. These promising results suggest the potential of our wavelength agile source for spectroscopic photoacoustic microscopy.

Paper Details

Date Published: 22 February 2011
PDF: 7 pages
Proc. SPIE 7899, Photons Plus Ultrasound: Imaging and Sensing 2011, 789944 (22 February 2011); doi: 10.1117/12.875875
Show Author Affiliations
Mengyang Liu, Univ. of Delaware (United States)
Takashi Buma, Univ. of Delaware (United States)

Published in SPIE Proceedings Vol. 7899:
Photons Plus Ultrasound: Imaging and Sensing 2011
Alexander A. Oraevsky; Lihong V. Wang, Editor(s)

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