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1S-2S transition frequency measurements in atomic hydrogen

1S-2S transition frequency measurements in atomic hydrogen. N. Kolachevsky. MPQ. The Team. Mobile fountain clock. Hydrogen. Michel Abgrall Daniele Rovera Christophe Salomon Philippe Laurent.

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1S-2S transition frequency measurements in atomic hydrogen

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  1. 1S-2S transition frequency measurements in atomic hydrogen N. Kolachevsky MPQ

  2. The Team Mobile fountain clock Hydrogen Michel AbgrallDaniele Rovera Christophe SalomonPhilippe Laurent Christian PartheyArthur MatveevJanis AlnisAxel BeyerNikolai KolachevskyRandolf PohlThomas UdemTheodor Häncsh Optical fiber link Katharina PredehlStefan DrosteRonald HolzwarthHarald SchnatzGesine GroscheThomas LegeroStefan Weyers Frequency comb Tobias WilkenBirgitta Benhardt Theory Ulrich JentsBrett Altschul

  3. Hydrogen Levels (n = 1, 2) Hyperfine structure Dirac QED Bohr

  4. Hydrogen Levels (n = 1, 2) Hyperfine structure Dirac QED Bohr

  5. QED: Schrödinger in atomic units: Dirac in atomic units: Energy levels Schrödinger: recoil: finite nuclear size:

  6. Talk by Randolf Pohl, Monday

  7. N. Kolachevsky et al., Opt. Lett. 36, 4299 (2011)

  8. at 972 nm 8-photon process => Master oscillator Beat note diode - dye laser 972 nm diode laser with a 20 cm long external resonator and intra-cavity EOM

  9. FP at zero expansion temperature Janis Alnis Typical drift @ Tc is of 50 mHz/s

  10. FP1-FP2 Allan deviation Thermal noise limit

  11. Comb-comb comparison setup 100 MHz system PLL Hydrogen maser I() Wenzel Chain  4  5  5 Distribution amplifier 1GHz  Wenzel Chain  4  5  5 temperature stabilized Stabilized optical fiber Fiber Laser 250 MHz system PLL I() FP5  1542 nm 1GHz

  12. Comb-comb comparison: result

  13. Optical measurement of the 2S HFS In zero magnetic field B: known precisely to be measured 1420 405.751 768(1) Hz

  14. 2s HFS result - 2009 FFK‘2009 N. Kolachevskyet al., PRL 102, 213002 (2009)

  15. C.G. Parthey et al., PRL 107, 203001 (2011)

  16. C.G. Parthey et al., PRL 107, 203001 (2011)

  17. C.G. Parthey et al., PRL 107, 203001 (2011)

  18. LNM-SYRTE, Observatoire de Paris Mobile fountain clock 34

  19. Thank you for attention! C.G. Parthey et al., PRL 107, 203001 (2011)

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