X-ray frequency combs from optically controlled resonance fluorescence

Cavaletto, Stefano M.; Harman, Z.; Buth, Christian; Keitel, Christoph H.

doi:10.1103/physreva.88.063402

Cited by 16 publications

(18 citation statements)

References 66 publications

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“…In our treatment, this is equivalent with investigating the coherence terms iρ 42 and iρ 31 [68,72]. Initially, the ensemble of 57 Fe nuclei is excited by the x-ray pulse at T o . Subsequently, the purely real 3 currents are abruptly built.…”

Section: Resultsmentioning

confidence: 99%

“…In Fig. 4.5 (a), a 57 Fe enriched solidstate target (the green cuboid) under the action of a static magnetic field (the red arrow) is bombarded by a train of hard x-ray pulses (the blue arrow). The x-ray propagates in the y-direction and its polarization is in the x-direction.…”

Section: Model and Time Scalesmentioning

confidence: 99%

“…With our proposal, one essentially could store a single hard x-ray photon in a 57 Fe solid-state sample, e.g., stainless steel, and retrieve it later without losing its original properties. Also, our proposal is based on the well developed NFS technique, and its implementation is therefore not far-fetched.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, an atomic nucleus and electromagnetic waves in the spectrum from VUV to hard x-rays are good candidates to construct such high precision systems. In addition to the recently developed XUV [55,56] and the proposed x-ray [57] frequency combs, the spotlighted ideas in this direction are a 229 Th "nuclear clock" [58,59] and a combined optical-x-ray Fabry-Pérot interferometer [37,60]. The 229 Th nucleus has a very narrow isomeric state at about 7.8 eV which is already accessible for VUV lasers which recommends it for a new generation of high-precision clocks based on nuclei.…”

Section: Introductionmentioning

confidence: 99%

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Coherent Control of Nuclei and X-Rays

Liao

2014

Springer Theses

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The possibility of mutual control of nuclei and photons offered by the emerging field of nuclear quantum optics is theoretically investigated in three different applications. This extension of quantum optics towards nuclei is motivated by modern X-ray Free Electron Lasers (XFEL) which open the possibility to coherently control nuclear states. As a first application we investigate the coherent population transfer between nuclear states in a three-level system driven by an XFEL. Such a level scheme is relevant for the triggering of isomers and might play a role for future energy storage solutions. The other way around, nuclei offer a platform to control single x-ray photons, which can be focused on spots essentially smaller than a single atom and used in future photonic circuits. The second part of this thesis puts forward a nuclear forward scattering setup that allows coherent control of a single x-ray photon using 57 Fe nuclei. Finally, we show that nuclear quantum optics provides a significant improvement for detection in nuclear physics. The low-lying isomeric transition of 229 Th can be addressed by VUV lasers and provides a potential next generation frequency standard. A main impediment is the large uncertainty of the nuclear transition frequency. Using an electromagnetically modified nuclear forward scattering setup, we show that coherence effects can reduce this uncertainty down to an unprecedented level.Within the framework of this thesis, the following articles were published in refereed journals:

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Section: Resultsmentioning

confidence: 99%

Section: Model and Time Scalesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Coherent Control of Nuclei and X-Rays

Liao

2014

Springer Theses

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“…Recently, an amplitude-shaping scheme was put forward to imprint a comb onto narrowband x rays 22 . Comb generation was also suggested 23 via quantum phase modulation 24 .…”

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confidence: 99%

Broadband high-resolution X-ray frequency combs

et al. 2014

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Optical frequency combs have had a remarkable impact on precision spectroscopy [1][2][3] . Enabling this technology in the x-ray domain is expected to result in wide-ranging applications, such as stringent tests of astrophysical models and quantum electrodynamics 4 , a more sensitive search for the variability of fundamental constants 5 , and precision studies of nuclear structure 6 . Ultraprecise xray atomic clocks may also be envisaged 7 . In this work, an x-ray pulse-shaping method is put forward to generate a comb in the absorption spectrum of an ultrashort high-frequency pulse. The method employs an opticalfrequency-comb laser, manipulating the system's dipole response to imprint a comb on an excited transition with a high photon energy. The described scheme provides higher comb frequencies and requires lower optical-comb peak intensities than currently explored methods [8][9][10] , preserves the overall width of the optical comb, and may be implemented by presently available x-ray technology 11 .The spectrum of an optical frequency comb consists of equally spaced, precisely known peaks, centred at an optical frequency . X-ray frequency combs would enable the aforementioned applications in the x-ray range. Stringent tests of fundamental physics may be pursued, e.g., accurate measurements of transition energies in highly charged ions, which are predicted to be more sensitive to the variability of fundamental constants 5 than currently investigated species. Presently, XUV combs (∼ 30 eV) are generated 10 via intracavity high-order harmonic generation (HHG) 8,9 . A femtosecond enhancement cavity is utilized to reach the required peak intensities [8][9][10] , up to ∼ 10 14 W/cm 2 . However, relativistic effects limit the efficiency of HHG at high harmonic orders 20. The investigation of schemes to further increase the carrier frequency of the comb at accessible driving intensities is therefore required.Short-wavelength light sources with improved brilliance and bandwidth 11 enable studies of x-ray quantum optics, e.g., in highly charged ions or nuclei 4,6,21 . Recently, an amplitude-shaping scheme was put forward to imprint a comb onto narrowband x rays 22. Comb generation was also suggested 23 via quantum phase modulation 24. However, these schemes are conditioned either by demanding requirements on the x-ray source Figure 1. Three-level scheme used to describe the interaction between the model system and the driving fields. (a) A low-density ensemble of ions, modelled as a three-level system, is driven by an ultrashort, broadband x-ray pulse (X1, solid, blue), exciting the fast decaying level 2, followed by an optical pulse (L1, dashed, red) coupling this excited state to the metastable state 3. Thereby the system is prepared in an initial state which is a superposition of states 1 and 3. (b) An optical frequency comb (L2, solid, red) is subsequently used to periodically drive the optical transition 2 ↔ 3. The emitted x rays (Xout, dashed, wavy, blue) lead to either gain or attenuation of the incident pulse X...

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Introduction

Liao

2013

Coherent Control of Nuclei and X-Rays

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X-ray frequency combs from optically controlled resonance fluorescence

Cited by 16 publications

References 66 publications

Coherent Control of Nuclei and X-Rays

Coherent Control of Nuclei and X-Rays

Broadband high-resolution X-ray frequency combs

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