High-power mid-IR comb generation for cavity-enhanced 2DIR spectroscopy

Silfies, Myles C

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https://hdl.handle.net/2142/100571 Copy

Description

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

Issue Date

2018-06-20

Keyword(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 ∆OD = 1 × 10−9/ √ Hz, enabling work in dilute molecular beams.a Similar methods can be applied to multidimensional spectroscopy as well.b 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 µm 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 µm 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 HNLFshifted combs. Cavity-enhanced mid-infrared combs in the 3-5 µm region will be applied to studying ultrafast dynamics of hydrogen-bonded clusters.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/100571

DOI

10.15278/isms.2018.WG03

Copyright and License Information

Copyright 2018 Myles C. Silfies

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