Jürgen Helmcke

Suppression of spurious phase shifts in an optical frequency standard

Fritz Riehle, Tilmann Trebst, Tomas Binnewies, 2000, Conference on Precision Electromagnetic Measurements. Conference Digest. CPEM 2000 (Cat. No.00CH37031).

Optical frequency standard based on cold Ca atoms

Harald Schnatz, Fritz Riehle, Uwe Sterr, 2003, IEEE Trans. Instrum. Meas..

The optical calcium frequency standard

Harald Schnatz, Fritz Riehle, Burghard Lipphardt, 1999, IEEE Trans. Instrum. Meas..

Atom Interferometry Based on Separated Light Fields

Wolfgang Ertmer, Fritz Riehle, Uwe Sterr, 1997 .

Optical frequency standards

Atsuo Morinaga, Jun Ishikawa, Fritz Riehle, 1989 .

Lasers and Coherent Light Sources

Katsumi Midorikawa, Orazio Svelto, Gerd Marowsky, 2012 .

Calibration of a Shack-Hartmann sensor for absolute measurements of wavefronts.

Fritz Riehle, Uwe Sterr, Jürgen Helmcke, 2005, Applied optics.

Improvement of the fractional uncertainty of a neutral-atom calcium optical frequency standard to 2×10-14

Fritz Riehle, Uwe Sterr, C. Degenhardt, 2003 .

He-Ne Laser Stabilized by Saturated Absorption in I2

Jürgen Helmcke, J. Helmcke, Friedrich Bayer-Helms, 1974 .

Laser cooling and deflection of a calcium atomic beam

Fritz Riehle, Jürgen Helmcke, A. Witte, 1992 .

High-resolution spectroscopy with laser-cooled and trapped calcium atoms

Fritz Riehle, Jürgen Helmcke, F. Riehle, 1994 .

The optical Ca frequency standard

Harald Schnatz, Fritz Riehle, Burghard Lipphardt, 1999, Proceedings of the 1999 Joint Meeting of the European Frequency and Time Forum and the IEEE International Frequency Control Symposium (Cat. No.99CH36313).