G. Wilpers

Absolute frequency measurements with a stabilized near-infrared optical frequency comb from a Cr:forsterite laser

T. Dennis, J.W. Nicholson, A. Bartels, 2004, Conference on Lasers and Electro-Optics, 2004. (CLEO)..

The optical calcium frequency standards of PTB and NIST

C. Degenhardt, H. Schnatz, F. Riehle, 2004 .

Frequency Uncertainty for Optically Referenced Femtosecond Laser Frequency Combs

M. Zucco, Kyoungsik Kim, Zhiyi Bi, 2007, IEEE Journal of Quantum Electronics.

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

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

Low-noise synthesis of microwave signals from an optical source

Leo W. Hollberg, Scott A. Diddams, Eugene Ivanov, 2005 .

Ultra-high stability optical frequency standard based on laser-cooled neutral calcium

A. Bartels, L. Hollberg, S.A. Diddams, 2005, (CLEO). Conference on Lasers and Electro-Optics, 2005..

Stabilized frequency comb with a self-referenced femtosecond Cr:forsterite laser

J.W. Nicholson, L. Hollberg, M. Yan, 2005, (CLEO). Conference on Lasers and Electro-Optics, 2005..

Improved uncertainty budget for optical frequency measurements with microkelvin neutral atoms: Results for a high-stability 40Ca optical frequency standard

Leo W. Hollberg, Christopher W. Oates, L. Hollberg, 2006 .

Calcium optical frequency standard with ultracold atoms: Approaching 10 -15 relative uncertainty

Harald Schnatz, Paul-Eric Pottie, Fritz Riehle, 2005 .

Extremely low noise microwave signals synthesized from stable CW lasers with femtosecond laser frequency combs

A. Bartels, L. Hollberg, S.A. Diddams, 2004, Conference on Lasers and Electro-Optics, 2004. (CLEO)..

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).

Optical frequency/wavelength references

Leo W. Hollberg, Scott A. Diddams, Chad Hoyt, 2005 .

Phase-coherent frequency measurement of the Ca intercombination line at 657 nm with a Kerr-lens mode-locked femtosecond laser

New Jersey, USA, Germany, 2000, physics/0010016.

An optical frequency standard with cold calcium atoms

Fritz Riehle, Uwe Sterr, C. Degenhardt, 2001 .