11 March 2015 A tunable MOPA laser for real-time optical resolution photoacoustic microscopy
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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.
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Mohammad Sultan Mahmud, Mohammad Sultan Mahmud, Alex Forbrich, Alex Forbrich, Peng Shao, Peng Shao, Wei Shi, Wei Shi, Roger J. Zemp, Roger J. Zemp, "A tunable MOPA laser for real-time optical resolution photoacoustic microscopy", Proc. SPIE 9323, Photons Plus Ultrasound: Imaging and Sensing 2015, 93233V (11 March 2015); doi: 10.1117/12.2077300; https://doi.org/10.1117/12.2077300

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