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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Phase-stabilized 100 mW frequency comb near 10 μm.

Kana Iwakuni1, Gil Porat1, Thinh Q Bui1

  • 11Department of Physics, JILA, National Institute of Standards and Technology and University of Colorado, University of Colorado, Boulder, CO 80309 USA.

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Summary

We developed a high-power, tunable mid-infrared frequency comb for molecular spectroscopy. This phase-stabilized system enables precise analysis of large molecules like C60.

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Area of Science:

  • Quantum Optics
  • Spectroscopy
  • Laser Physics

Background:

  • Long-wavelength mid-infrared (MIR) frequency combs are crucial for molecular spectroscopy.
  • High power and tunability are essential for investigating complex molecules such as C60.

Purpose of the Study:

  • To present a high-power, phase-stabilized frequency comb operating near 10 μm.
  • To demonstrate its tunability and application in molecular spectroscopy.

Main Methods:

  • Generation of a frequency comb using a synchronously pumped, singly resonant optical parametric oscillator (OPO).
  • Utilizing an AgGaSe2 nonlinear crystal for MIR generation.
  • Phase-locking of the idler wave's repetition rate (f_rep) and carrier-envelope offset frequency (f_ceo) to microwave signals.

Main Results:

  • Continuous tuning of the OPO from 8.4 to 9.5 μm.
  • Maximum average idler power of 100 mW achieved at 8.5 μm.
  • Successful phase-stabilization of the frequency comb's key parameters.

Conclusions:

  • The developed AgGaSe2-based OPO is a powerful tool for MIR frequency comb generation.
  • This system offers high power and tunability for precise molecular spectroscopy.
  • Potential applications include sensitive direct frequency comb spectroscopy of large molecules.