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Title:HIGH-POWER MID-IR COMB GENERATION FOR CAVITY-ENHANCED 2DIR SPECTROSCOPY
Author(s):Silfies, Myles C
Contributor(s):Allison, Thomas K.; Diddams, Scott; Lind, Alex; Kowligy, Abijith S; Timmers, Henry; Chen, Yuning
Subject(s):Mini-symposium: Frequency-Comb Spectroscopy
Abstract:Using frequency combs and optical cavities, we have previously demonstrated ultrafast transient absorption measurements with a detection limit of $\Delta$OD $= 1 \times 10^{-9} /\sqrt{\textrm{Hz}}$, enabling work in dilute molecular beams.\footnote{M. A. R. Reber, Y. Chen, and T. K. Allison, Optica \textbf{3}, 311 (2016).} Similar methods can be applied to multidimensional spectroscopy as well.\footnote{T. K. Allison, J. Phys. B: At. Mol. Opt. Phys. \textbf{50}, 044004 (2017).} Since molecules undergoing ultrafast dynamics have broad spectral features, cavity-enhanced ultrafast spectroscopy then demands broadband and widely tunable frequency combs. Here we present a frequency conversion setup for the generation of high power mid infrared frequency combs in the 3-10 $\mu$m region. The initial comb is generated using an Er:fiber oscillator with 100 MHz repetition rate. After nonlinear amplification, the comb is shifted in a highly nonlinear fiber (HNLF) to 1 $\mu$m and amplified to 10 W in a home built, multi-stage Yb:fiber amplifier. We have measured the output comb tooth linewidth to be less than 10 kHz and the pulse duration is 120 fs. This laser is then used as a pump for several nonlinear difference frequency generation stages seeded by additional HNLF-shifted combs. Cavity-enhanced mid-infrared combs in the 3-5 $\mu$m region will be applied to studying ultrafast dynamics of hydrogen-bonded clusters.
Issue Date:06/20/18
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:APS
Genre:Conference Paper / Presentation
Type:Text
Language:English
URI:http://hdl.handle.net/2142/100571
DOI:10.15278/isms.2018.WG03
Other Identifier(s):WG03
Date Available in IDEALS:2018-08-17
2018-12-12


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