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Doppler-Free Spectroscopy of the S-1(0)-P-3(0) Optical Clock Transition in Laser-Cooled Fermionic Isotopes of Neutral Mercury

LNE-SYRTE, Observatoire de Paris, 75014 Paris, France.
Physical Review Letters (Impact Factor: 7.51). 11/2008; 101(18):183004. DOI: 10.1103/PhysRevLett.101.183004
Source: PubMed

ABSTRACT We report direct laser spectroscopy of the 1S0-3P0 transition at 265.6 nm in fermionic isotopes of neutral mercury in a magneto-optical trap. Measurements of the frequency against the LNE-SYRTE primary reference using an optical frequency comb yield 1 128 575 290 808.4+/-5.6 kHz in 199Hg and 1 128 569 561 139.6+/-5.3 kHz in 201Hg. The uncertainty, allowed by the observation of the Doppler-free recoil doublet, is 4 orders of magnitude lower than previous indirect determinations. Mercury is a promising candidate for future optical lattice clocks due to its low sensitivity to blackbody radiation.

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    • "In this paper, we present a Fabry–Pérot-based ultrastable source at infrared wavelengths, extended to the deep ultraviolet for use as an interrogation signal of the 1 S 0 – 3 P 0 clock transition in mercury at 265.6 nm [9] [10]. The Fabry–Pérot cavity in our case is designed to be highly immune to environmental perturbations such as * Electronic address: sebastien.bize@obspm.fr "
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    ABSTRACT: We have developed an ultra-stable source in the deep ultraviolet, suitable to fulfill the interrogation requirements of a future fully-operational lattice clock based on neutral mercury. At the core of the system is a Fabry-P\'erot cavity which is highly impervious to temperature and vibrational perturbations. The mirror substrate is made of fused silica in order to exploit the comparatively low thermal noise limits associated with this material. By stabilizing the frequency of a 1062.6 nm Yb-doped fiber laser to the cavity, and including an additional link to LNE-SYRTE's fountain primary frequency standards via an optical frequency comb, we produce a signal which is both stable at the 1E-15 level in fractional terms and referenced to primary frequency standards. The signal is subsequently amplified and frequency-doubled twice to produce several milliwatts of interrogation signal at 265.6 nm in the deep ultraviolet. Comment: 7 pages, 6 figures
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