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Proceedings Paper

Mid-IR photothermal imaging with a compact ultrafast fiber probe laser
Author(s): Hui Liu; Atcha Totachawattana; Alket Mërtiri; Mi K. Hong; Tim Gardner; Shyamsunder Erramilli; Michelle Y. Sander
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Paper 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.

Paper Details

Date Published: 17 September 2014
PDF: 6 pages
Proc. SPIE 9198, Ultrafast Nonlinear Imaging and Spectroscopy II, 919808 (17 September 2014); doi: 10.1117/12.2061408
Show Author Affiliations
Hui Liu, Boston Univ. (United States)
Atcha Totachawattana, Boston Univ. (United States)
Alket Mërtiri, Boston Univ. (United States)
Mi K. Hong, Boston Univ. (United States)
Tim Gardner, Boston Univ. (United States)
Shyamsunder Erramilli, Boston Univ. (United States)
Michelle Y. Sander, Boston Univ. (United States)

Published in SPIE Proceedings Vol. 9198:
Ultrafast Nonlinear Imaging and Spectroscopy II
Zhiwen Liu, Editor(s)

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