Long-wavelength mid-infrared (MIR) frequency combs with high power and flexible tunability are highly desired for molecular spectroscopy, including investigation of large molecules such as C60. We present a high power, phase-stabilized frequency comb near 10 μm, generated by a synchronously pumped, singly resonant optical parametric oscillator (OPO) based on AgGaSe2. The OPO can be continuously tuned from 8.4 to 9.5 μm, with a maximum average idler power of 100 mW at the center wavelength of 8.5 μm. Both the repetition rate (frep) and the carrier-envelope offset frequency (fceo) of the idler wave are phase-locked to microwave signals referenced to a Cs clock. We describe the detailed design and construction of the frequency comb, and discuss potential applications for precise and sensitive direct frequency comb spectroscopy.
CITATION STYLE
Iwakuni, K., Porat, G., Bui, T. Q., Bjork, B. J., Schoun, S. B., Heckl, O. H., … Ye, J. (2018). Phase-stabilized 100 mW frequency comb near 10 μm. Applied Physics B: Lasers and Optics, 124(7). https://doi.org/10.1007/s00340-018-6996-8
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