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Proceedings Paper

A tunable MOPA laser for real-time optical resolution photoacoustic microscopy
Author(s): Mohammad Sultan Mahmud; Alex Forbrich; Peng Shao; Wei Shi; Roger J. Zemp
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Paper Abstract

We demonstrate the first time a widely tunable MOPA (Master Oscillator Power Amplifier) laser system for Optical resolution photoacoustic microscopy (OR-PAM). This unique laser is capable of tuning the repetition rate (0.1- 120MHz), the wavelength (1030-1080nm), the pulse-width (100ps-5ns) and power (up to 1.1W). It is also capable of programmable dithering and synchronization with other laser systems to within ~ps jitter. To apply it to OR-PAM we take advantage of frequency doubling to convert IR light into green light. For doubling, a periodically poled magnesium doped lithium niobate (MgO:LiNbO3) crystal was chosen. Wavelength tuning was accomplished by tuning the output wavelength of the MOPA then tuning the temperature of the (MgO:LiNbO3) crystal to generate tunable visible light. Characterization of the system performance revealed a lateral resolution of ~7μm and a SNR of ~21dB when imaging 7μm carbon fibers.

Paper Details

Date Published: 11 March 2015
PDF: 4 pages
Proc. SPIE 9323, Photons Plus Ultrasound: Imaging and Sensing 2015, 93233V (11 March 2015); doi: 10.1117/12.2077300
Show Author Affiliations
Mohammad Sultan Mahmud, Univ. of Alberta (Canada)
Alex Forbrich, Univ. of Alberta (Canada)
Peng Shao, Univ. of Alberta (Canada)
Wei Shi, Univ. of Alberta (Canada)
Roger J. Zemp, Univ. of Alberta (Canada)

Published in SPIE Proceedings Vol. 9323:
Photons Plus Ultrasound: Imaging and Sensing 2015
Alexander A. Oraevsky; Lihong V. Wang, Editor(s)

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