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Published March 28, 2011 | Published
Journal Article Open

Broadband degenerate OPO for mid-infrared frequency comb generation

Abstract

We present a new technique suitable for generating broadband phase- and frequency-locked frequency combs in the mid-infrared. Our source is based on a degenerate optical parametric oscillator (OPO) which rigorously both down-converts and augments the spectrum of a pump frequency comb provided by a commercial mode-locked near-IR laser. Low intracavity dispersion, combined with extensive cross-mixing of comb components, results in extremely broad instantaneous mid-IR bandwidths. We achieve an output power of 60 mW and 20dB bandwidth extending from 2500 to 3800 nm. Among other applications, such a source is well-suited for coherent Fourier-transform spectroscopy in the absorption-rich mid-IR 'molecular fingerprint' region.

Additional Information

© 2011 Optical Society of America. Received 26 Jan 2011; revised 25 Feb 2011; accepted 25 Feb 2011; published 18 Mar 2011. The authors thank Tim Brand for fabricating PPLN crystals designed for operation at Brewster angle. We gratefully acknowledge support from the US Office of Naval Research (ONR), NASA, Air Force Office of Scientific Research (AFOSR), Agilent Technologies and Stanford Medical School.

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August 19, 2023
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