All-solid-state VUV frequency comb at 160 nm using high-harmonic generation in nonlinear femtosecond enhancement cavity

Seres, J.; Seres, E.; Serrat, Carles; Young, Erin C.; Speck, James S.; Schumm, Thorsten

doi:10.1364/oe.27.006618

Cited by 21 publications

(12 citation statements)

References 39 publications

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“…The team at TU Vienna recently demonstrated solid-HHG in a passive enhancement cavity, realizing a VUV frequency comb (see Fig. 3.12) [129]. The system is based on a commercial 0.9 W Ti:sapphire femtosecond oscillator (FC8004, Menlo Systems) generating 27 fs pulses at a repetition rate of 108 MHz, at 800 nm central wavelength.…”

Section: Narrow-band Solid-state Vuv Frequency Combmentioning

confidence: 99%

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Nuclear clocks for testing fundamental physics

Peik

Schumm

Safronova

et al. 2021

Quantum Sci. Technol.

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The low-energy, long-lived isomer in 229Th, first studied in the 1970s as an exotic feature in nuclear physics, continues to inspire a multidisciplinary community of physicists. It has stimulated innovative ideas and studies that expand the understanding of atomic and nuclear structure of heavy elements and of the interaction of nuclei with bound electrons and coherent light. Using the nuclear resonance frequency, determined by the strong and electromagnetic interactions inside the nucleus, it is possible to build a highly precise nuclear clock that will be fundamentally different from all other atomic clocks based on resonant frequencies of the electron shell. The nuclear clock will open opportunities for highly sensitive tests of fundamental principles of physics, particularly in searches for violations of Einstein’s equivalence principle and for new particles and interactions beyond the standard model. It has been proposed to use the nuclear clock to search for variations of the electromagnetic and strong coupling constants and for dark matter searches. The 229Th nuclear optical clock still represents a major challenge in view of the tremendous gap of nearly 17 orders of magnitude between the present uncertainty in the nuclear transition frequency (about 0.2 eV, corresponding to ∼48 THz) and the natural linewidth (in the mHz range). Significant experimental progress has been achieved in recent years, which will be briefly reviewed. Moreover, a research strategy will be outlined to consolidate our present knowledge about essential 229mTh properties, to determine the nuclear transition frequency with laser spectroscopic precision, realize different types of nuclear clocks and apply them in precision frequency comparisons with optical atomic clocks to test fundamental physics. Two avenues will be discussed: laser-cooled trapped 229Th ions that allow experiments with complete control on the nucleus–electron interaction and minimal systematic frequency shifts, and Th-doped solids enabling experiments at high particle number and in different electronic environments.

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Section: Narrow-band Solid-state Vuv Frequency Combmentioning

confidence: 99%

“…3.13: High harmonics generated within the solid-state HHG approach. Black line indicates the single-pass yield, red line the yield obtained within the passive enhancement cavity (from [129]).…”

Section: Narrow-band Solid-state Vuv Frequency Combmentioning

confidence: 99%

Nuclear clocks for testing fundamental physics

Peik

Schumm

Safronova

et al. 2021

Quantum Sci. Technol.

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“…We acknowledge discussions with Chuankun Zhang, Christian Sanner and Jun Ye As long as no cw laser source for nuclear clock operation is available, direct frequency comb spectroscopy appears to be the only alternative. Frequency combs in the visible and infrared have been converted into the VUV region via high-harmonic generation (HHG) [16,23,62,71,106,137,154,251,253,271,275,310,324,415,418]. Also, direct frequency-comb spectroscopy of electronic shell transitions has already been performed [71,252,254].…”

Section: Laser Systems For Nuclear Clock Developmentmentioning

confidence: 99%

“…Using existing technology, there are two promising paths to generate a highpower frequency comb at around 150 nm. One way is via 7th harmonic generation of an Yb-doped fiber frequency comb [406], the second way is via 5th harmonic generation of a Ti:Sapphire system [324]. Direct frequency-comb spectroscopy of Xe using the 7th harmonic of an Yb-doped fiber system has already been performed, and the same concept could also be used for nuclear laser spectroscopy of 229m Th [252].…”

Section: Laser Systems For Nuclear Clock Developmentmentioning

confidence: 99%

“…The achievable precision would be determined by the bandwidth of the laser light used for excitation, which is ≈ 10 GHz (40 µeV). An alternative approach is based on a VUV frequency comb generated from the 5th harmonic of a Ti:Sapphire laser and is under development at TU Vienna [324,408]. A system that operates with the 7th harmonic of an Yb:doped fiber laser is located at JILA, Boulder, CO [406,418].…”

Section: Population Via Direct Excitationmentioning

confidence: 99%

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The $$^{229}$$Th isomer: prospects for a nuclear optical clock

Wense

2020

Eur. Phys. J. A

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The proposal for the development of a nuclear optical clock has triggered a multitude of experimental and theoretical studies. In particular the prediction of an unprecedented systematic frequency uncertainty of about $$10^{-19}$$ 10 - 19 has rendered a nuclear clock an interesting tool for many applications, potentially even for a re-definition of the second. The focus of the corresponding research is a nuclear transition of the $$^{229}$$ 229 Th nucleus, which possesses a uniquely low nuclear excitation energy of only $$8.12\pm 0.11$$ 8.12 ± 0.11 eV ($$152.7\pm 2.1$$ 152.7 ± 2.1 nm). This energy is sufficiently low to allow for nuclear laser spectroscopy, an inherent requirement for a nuclear clock. Recently, some significant progress toward the development of a nuclear frequency standard has been made and by today there is no doubt that a nuclear clock will become reality, most likely not even in the too far future. Here we present a comprehensive review of the current status of nuclear clock development with the objective of providing a rather complete list of literature related to the topic, which could serve as a reference for future investigations.

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