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Hongtao Chen

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Proceedings Article | 13 February 2009 Paper

Coupling CARS with multiphoton fluorescence and high harmonic generation imaging modalities using a femtosecond laser source

Hongtao Chen, Mikhail Slipchenko, Jiabin Zhu, Kimberly Buhman, Ji-Xin Cheng

Proceedings Volume 7183, 718315 (2009) https://doi.org/10.1117/12.808223

KEYWORDS: Second-harmonic generation, Liver, CARS tomography, Microscopes, Optical parametric oscillators, Femtosecond phenomena, Sensors, Tissues, Signal detection, Picosecond phenomena

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Multimodal nonlinear optical imaging has opened new opportunities and becomes a powerful tool for imaging complex tissue samples with inherent 3D spatial resolution.. We present a robust and easy-to-operate approach to add the coherent anti-stokes Raman scattering (CARS) imaging modality to a widely used multiphoton microscope. The laser source composed of a Mai Tai femtosecond laser and an optical parametric oscillator (OPO) offers one-beam, two-beam and three-beam modalities. The Mai Tai output at 790 nm is split into two beams, with 80% of the power being used to pump the OPO. The idler output at 2036 nm from OPO is doubled using a periodically poled lithium niobate (PPLN) crystal. This frequency-doubled idler beam at 1018 nm is sent through a delay line and collinearly combined with the other Mai Tai beam for CARS imaging on a laser-scanning microscope. This Mai Tai beam is also used for multiphoton fluorescence and second harmonic generation (SHG) imaging. The signal output at 1290 nm from OPO is used for SHG and third-harmonic generation (THG) imaging. External detectors are installed for both forward and backward detection, whereas two internal lamda-scan detectors are employed for microspectroscopy analysis. This new system allows vibrationally resonant CARS imaging of lipid bodies, SHG imaging of collagen fibers, and multiphoton fluorescence analysis in fresh tissues. As a preliminary application, the effect of diacylglycerol acyltransferase 1 (DGAT1) deficiency on liver lipid metabolism in mice was investigated.

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