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Updated: May 24, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
Vacuum ultraviolet frequency combs generated by a femtosecond enhancement cavity in the visible
Birgitta Bernhardt1, Akira Ozawa, Andreas Vernaleken
1Max-Planck-Institut für Quantenoptik, Garching, Germany. Birgitta.Bernhardt@mpq.mpg.de
Abstract:
We present the first (to our best knowledge) femtosecond enhancement cavity in the visible wavelength range for ultraviolet frequency comb generation. The cavity is seeded at 518 nm by a frequency-doubled Yb fiber laser and operates at a peak intensity of 1.2×10(13) W/cm(2). High harmonics of up to the ninth order (~57 nm) are generated in an intracavity xenon gas jet. Intracavity high harmonic powers of several milliwatts for the third harmonic order and microwatts for the fifth harmonic order prove the potential of the "green cavity" as an efficient ultraviolet frequency comb source for future spectroscopic experiments. A limiting degradation effect of the cavity mirrors is avoided by operating at a constant oxygen background pressure.
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