NDLI: Mid-infrared frequency comb spanning an octave based on an Er fiber laser and difference-frequency generation

Content Provider	IEEE Xplore Digital Library
Author	Amarie, S. Keilmann, F.
Copyright Year	2013
Description	Author affiliation: Neaspec GmbH, Martinsried, Germany (Amarie, S.) \|\| LASNIX, Berg, Germany (Keilmann, F.)
Abstract	Summary form only given. We describe a coherent mid-infrared continuum source with 700 $cm^{-1}$ usable bandwidth, readily tuned within 600-2500 $cm^{-1}$ (18-75 THz) and thus covering much of the infrared "fingerprint" molecular vibration region [1]. It is based on nonlinear frequency conversion in GaSe using a compact commercial 100-fs-pulsed Er fiber laser system providing two amplified near-infrared beams, one of them broadened by a nonlinear optical fiber. The resulting collimated mid-infrared continuum beam of 1 mW quasi-cw power represents a coherent infrared frequency comb with zero carrier-envelope phase, containing about 500,000 modes that are exact multiples of the pulse repetition rate of 40 MHz. The beam's diffraction-limited performance enables long-distance spectroscopic probing as well as maximal focusability for classical and ultraresolving near-field microscopies. Applications are foreseen also in studies of transient chemical phenomena even at ultrafast pump-probe scale, and in high-resolution gas spectroscopy for e.g. breath analysis.One application area is spectroscopic near-field microscopy where near-field spectra were obtained in exploring polymer fingerprints at 20 nm spatial resolution [2-7]. For the first time, a multitude of resonances between 750 and 1730 cm-1 could be determined with the help of this novel coherent continuum source (Fig. 1).A final positive aspect of mid-infrared dual-comb spectroscopy [5,6] is the ability to record spectra in rapid sequence, thus allowing to follow chemical reactions in real time. Even ultrafast phenomena could be probed with our coherent mid-infrared source. To understand this recall it emits repetitive pulses of sub 100 fs duration which can be systematically delayed o r advanced in respect to a "pump" pulse which could induce specific excitations of a sample.
Sponsorship	Eur. Phys. Soc.
Starting Page	1
Ending Page	1
File Size	199830
Page Count	1
File Format	PDF
e-ISBN	9781479905942
DOI	10.1109/CLEOE-IQEC.2013.6800811
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-05-12
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Spectroscopy Chemical lasers Minerals Nanobioscience Chemicals Erbium Fiber lasers
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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