Berlin 2014 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 49: Precision measurements and metrology II (with Q)

A 49.3: Vortrag

Donnerstag, 20. März 2014, 17:30–17:45, DO24 1.101

X-ray frequency combs via optical quantum control — •S. M. Cavaletto, Z. Harman, Z. Liu, C. Ott, C. Buth, T. Pfeifer, and C. H. Keitel — Max Planck Institute for Nuclear Physics, Heidelberg, Germany

Optical frequency combs had a revolutionary impact on precision spectroscopy and metrology. The spectrum of a frequency comb, consisting of evenly spaced lines, is the result of an infinite train of femtosecond pulses produced in a mode-locked ultrafast laser. Recently, frequency-comb technology was extended to the extreme-ultraviolet spectral regime via high-harmonic generation (HHG) in a femtosecond-enhancement cavity [1]. We propose optical schemes to transfer the coherence of a driving, optical frequency comb to the radiation emitted by transitions of higher frequencies [2,3,4]. The comb structure we predict in the x-ray emission or absorption spectra might eventually represent an alternative scheme for x-ray frequency-comb generation, able to overcome the frequency limitations of present HHG-based methods. – [1] A. Cingöz et al., Nature 482, 68 (2012). [2] S. M. Cavaletto et al., Phys. Rev. A 88, 063402 (2013). [3] Z. Liu et al., submitted (2013); arXiv:1309.6335. [4] S. M. Cavaletto et al., submitted (2013).