17 September 2014 Mid-IR photothermal imaging with a compact ultrafast fiber probe laser
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A mid-IR photothermal imaging system is presented that features an integrated ultrafast erbium-doped fiber probe laser for the first time. With a mid-IR tunable quantum cascade laser (QCL) as the pump laser, vibrational molecular modes are excited and the thermally-induced changes in the refractive index are measured with a probe laser. The custom-built, all-fiber ultrafast probe laser at telecommunication wavelengths is compact, robust and thus an attractive source compared to bulky and alignment sensitive Ti:sapphire probe lasers. We present photothermal spectra and images with good contrast for a liquid crystal sample, demonstrating highly sensitive, label-free photothermal microscopy with a mode-locked fiber probe laser.
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Hui Liu, Hui Liu, Atcha Totachawattana, Atcha Totachawattana, Alket Mërtiri, Alket Mërtiri, Mi K. Hong, Mi K. Hong, Tim Gardner, Tim Gardner, Shyamsunder Erramilli, Shyamsunder Erramilli, Michelle Y. Sander, Michelle Y. Sander, "Mid-IR photothermal imaging with a compact ultrafast fiber probe laser", Proc. SPIE 9198, Ultrafast Nonlinear Imaging and Spectroscopy II, 919808 (17 September 2014); doi: 10.1117/12.2061408; https://doi.org/10.1117/12.2061408

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