Concepts for direct frequency-comb spectroscopy of 229mTh and an internal-conversion-based solid-state nuclear clock

@article{vonderWense2020ConceptsFD,
  title={Concepts for direct frequency-comb spectroscopy of 229mTh and an internal-conversion-based solid-state nuclear clock},
  author={Lars C. von der Wense and Chuankun Zhang},
  journal={European Physical Journal D},
  year={2020},
  volume={74},
  pages={146}
}
A new concept for narrow-band direct nuclear laser spectroscopy of 229m Th is proposed, using a single comb mode of a vacuum ultraviolet frequency comb generated from the 7th harmonic of an Yb-doped fiber laser system. In this concept more than 1013 229 Th atoms on a surface are irradiated in parallel and a successful nuclear excitation is probed via the internal-conversion (IC) decay channel. A net scanning time of 15 min for the most recent 1σ energy uncertainty interval of 0.34 eV appears to… Expand
8 Citations
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References

SHOWING 1-10 OF 164 REFERENCES
The concept of laser-based conversion electron Mössbauer spectroscopy for a precise energy determination of 229mTh
Abstract229Th is the only nucleus currently under investigation for the development of a nuclear optical clock (NOC) of ultra-high accuracy. The insufficient knowledge of the first nuclear excitationExpand
Energy of the 229Th nuclear clock transition
TLDR
The method combines nuclear and atomic physics measurements to advance precision metrology, and the findings are expected to facilitate the application of high-resolution laser spectroscopy on nuclei and to enable the development of a nuclear optical clock of unprecedented accuracy. Expand
Performance of a 229 Thorium solid-state nuclear clock
The 7.8 eV nuclear isomer transition in 229thorium has been suggested as a clock transition in a new type of optical frequency standard. Here we discuss the construction of a ‘solid-state nuclearExpand
X-ray pumping of the 229Th nuclear clock isomer
TLDR
Active optical pumping is presented using narrow-band 29-kiloelectronvolt synchrotron radiation to resonantly excite the second excited state of 229Th, which then decays predominantly into the isomer, enabling accurate determination of the 229mTh isomer’s energy, half-life and excitation linewidth. Expand
Constraining the evolution of the fundamental constants with a solid-state optical frequency reference based on the 229Th nucleus.
TLDR
It is argued that the 229Th optical nuclear transition may be driven inside a host crystal with a high transition Q to allow for the construction of a solid-state optical frequency reference that surpasses the short-term stability of current optical clocks, as well as improved limits on the variability of fundamental constants. Expand
A frequency comb in the extreme ultraviolet
TLDR
This work demonstrates intra-cavity high harmonic generation in the extreme ultraviolet, which promises to lead to another joint frontier of precision spectroscopy and ultrafast science. Expand
Direct frequency comb spectroscopy in the extreme ultraviolet
TLDR
The generation of extreme-ultraviolet frequency combs, reaching wavelengths of 40 nanometres, is reported by coupling a high-power near-infrared frequency comb to a robust femtosecond enhancement cavity, and the absolute frequency of the argon transition has been determined by direct frequency comb spectroscopy. Expand
All-solid-state VUV frequency comb at 160 nm using high-harmonic generation in nonlinear femtosecond enhancement cavity.
TLDR
The emerging nonlinear effects in the solid medium, together with suitable intra-cavity dispersion management, support optimal enhancement and stable locking in a solid-state-based vacuum ultraviolet frequency comb by harmonics generation in an external enhancement cavity. Expand
Single ion fluorescence excited with a single mode of an UV frequency comb
TLDR
The authors demonstrate direct frequency comb spectroscopy to shorter wavelengths by probing a transition frequency in a trapped Mg+ ion using a single mode of a UV frequency comb. Expand
Direct detection of the 229Th nuclear clock transition
TLDR
The direct detection of this nuclear state of 229mTh is reported, which is further confirmation of the existence of the isomer and lays the foundation for precise studies of its decay parameters. Expand
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