X-ray frequency combs from optically controlled resonance fluorescence

Abstract

An x-ray pulse-shaping scheme is put forward for imprinting an optical frequency comb onto the radiation emitted on a driven x-ray transition, thus producing an x-ray frequency comb. A four-level system is used to describe the level structure of N ions driven by narrow-bandwidth x rays, an optical auxiliary laser, and an optical frequency comb. By including many-particle enhancement of the emitted resonance fluorescence, a spectrum is predicted consisting of equally spaced narrow lines which are centered on an x-ray transition energy and separated by the same tooth spacing as the driving optical frequency comb. Given a known x-ray reference frequency, our comb could be employed to determine an unknown x-ray frequency. While relying on the quality of the light fields used to drive the ensemble of ions, the model has validity at energies from the 100 eV to the keV range.

11 pages, 2 figures

References in corpus (6)

• Hole transitions in multiply-charged ions for precision laser spectroscopy and searching for alpha-variation
• Electromagnetically induced transparency for x rays
• Resonance fluorescence in ultrafast and intense x-ray free-electron-laser pulses
• Interference in the resonance fluorescence of two incoherently coupled transitions
• Searching for New Physics Through AMO Precision Measurements
• X-ray refractive index of laser-dressed atoms

Cited by in corpus (7)

• Broadband high-resolution x-ray frequency combs
• Neon in ultrashort and intense x rays from free electron lasers
• Interrogating the temporal coherence of EUV frequency combs with highly charged ions
• High-order harmonic generation with resonant core excitation by ultraintense x rays
• Rate equations for nitrogen molecules in ultrashort and intense x-ray pulses
• Optical control of an atomic inner-shell x-ray laser
• Nonlinearity in the sequential absorption of multiple photons