Harmonic frequency comb covering the mid-infrared molecular fingerprint region

Pupeza, Ioachim

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https://hdl.handle.net/2142/100666 Copy

Description

Title

Harmonic frequency comb covering the mid-infrared molecular fingerprint region

Author(s)

Pupeza, Ioachim

Contributor(s)

• Limpert, Jens
• Krausz, Ferenc
• Vamos, Lenard
• Hofer, Christina
• Gerz, Daniel
• Butler, Thomas
• Heuermann, Tobias
• Gebhardt, Martin
• Gaida, Christian

Issue Date

2018-06-20

Keyword(s)

Mini-symposium: Frequency-Comb Spectroscopy

Abstract

We present a multi-channel harmonic frequency comb covering the mid-infrared spectral range between 15 and 85 THz (or 3.5 - 20 µm, or 500 to 2860 cm−1 ) with a record 1- mW/THz-level power spectral density. An Erfiber-based oscillator is wavelength-shifted to a central wavelength of 1960 nm and a chirpedpulse Tm-fiber amplifier provides a 50-MHzrepetition-rate train of 250-fs pulses with 120 W of average power. Nonlinear self-compression in two fused-silica fibers results in two channels, yielding 11-fs pulses with 4.5 W (Channel 1) and 25-fs pulses with 25 W (Channel 2). Subsequent intrapulse difference-frequency generation (DFG) in 1-mm-thin GaSe crystals results in a coverage of the entire molecular fingerprint region with only two phase matching angles for each channel (see Figure). DFG inherently provides phase-stable pulses, leading to a harmonic frequency comb. The 120-W average power of the near-infrared frontend suffices for the parallel implementation of multiple channels, facilitating broadband spectroscopy.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/100666

DOI

10.15278/isms.2018.WG02

Copyright and License Information

Copyright 2018 Ioachim Pupeza

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