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Issue		Europhys. Lett. Volume 44, Number 2, October 1998
Page(s)		186 - 191
Section		Atomic, molecular and optical physics
DOI		10.1209/epl/i1998-00455-9

DOI: 10.1209/epl/i1998-00455-9


Europhys. Lett, 44 (2), pp. 186-191 (1998)

Optical Ramsey spectroscopy of atomic hydrogen

B. Gross, A. Huber, M. Niering, M. Weitz and T. W. Hänsch

Max-Planck-Institut für Quantenoptik
Hans-Kopfermann-Straße 1, 85748 Garching, Germany

(received 1 July 1998; accepted 31 August 1998)

PACS. 39.30$\rm +w$ - Spectroscopic techniques.
PACS. 32.30Jc - Visible and ultraviolet spectra.
PACS. 42.62Fi - Laser spectroscopy.

Abstract:

We report the observation of optical Ramsey fringes on the two-photon 1S-2S transition in atomic hydrogen with a pulsed temporal excitation scheme. With this technique we have improved the spectral resolution of this transition to a linewidth of 800 Hz at 243 nm, corresponding to 6 parts in 10¹³, setting a new record for neutral atoms. By applying a large number of light pulses we observe sharply peaked lines in the spectrum rather than the sinusoidal pattern obtained with two excitation pulses.

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