Physics
Scientific paper
Jun 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mss..conferd03j&link_type=abstract
"International Symposium On Molecular Spectroscopy, 65th Meeting, Held 21-25 June, 2010 at Ohio State University. http://molspec
Physics
Mini-Symposium: Precision/Frequency Combs
Scientific paper
A mid-infrared frequency comb tunable from 2.7μm to 4.7μm (3700cm-1 to 2100cm-1) has been produced using a fiber laser and difference frequency generation in a periodically poled LiNbO_3 (PPLN) crystal. An amplified Yb-doped femtosecond fiber laser is centered at a wavelength of 1.04μm, with 100MHz repetition frequency and up to 2.5W average output power. Part of this laser power is focused into a photonic crystal fiber to produce a Raman-shifted soliton tunable over a range from 1.3μm to 1.7μm. The remaining 1.04μm light is combined with the wavelength-shifted spectrum and focused into the PPLN to produce a difference frequency comb spanning ˜200nm (180cm-1) in the mid-infrared. By adjusting the Raman-shifted soliton and PPLN, the center wavelength of the MIR comb is tuned over the output range, with a maximum power of up to 35mW near 3.3μm.
Sum frequency generation between the MIR comb and a CW 1064nm laser shifts the frequency comb spectrum back into the near-infrared around 800nm. This sum frequency step is taken in order to utilize detectors and techniques that are currently more accessible in the visible and near-infrared ranges. Preliminary results have shown MIR methane absorption lines observable in the upconverted 800nm spectrum on a commercial optical spectrum analyzer. We intend to measure this upconverted spectrum at high resolution using a two-dimensional dispersion and imaging technique to take advantage of the precisely known frequency characteristics of each individual MIR comb line.
L. Hollberg, V. Mbele, and S. A. Diddams, Nature 445, 627 (2007).
Diddams Scott A.
Johnson Todd A.
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