Mid-IR photothermal imaging with a compact ultrafast fiber probe laser

Hui Liu; Atcha Totachawattana; Alket Mërtiri; Mi K. Hong; Tim Gardner; Shyamsunder Erramilli; Michelle Y. Sander

doi:10.1117/12.2061408

17 September 2014 Mid-IR photothermal imaging with a compact ultrafast fiber probe laser

Hui Liu, Atcha Totachawattana, Alket Mërtiri, Mi K. Hong, Tim Gardner, Shyamsunder Erramilli, Michelle Y. Sander

Proceedings Volume 9198, Ultrafast Nonlinear Imaging and Spectroscopy II; 919808 (2014) https://doi.org/10.1117/12.2061408
Event: SPIE Optical Engineering + Applications, 2014, San Diego, California, United States

Abstract

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.

Citation Download Citation

Hui Liu, Atcha Totachawattana, Alket Mërtiri, Mi K. Hong, Tim Gardner, Shyamsunder Erramilli, and 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); https://doi.org/10.1117/12.2061408

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