Title :
Phase-coherent measurement of the hydrogen 1S-2S frequency with an optical frequency interval divider chain
Author :
Udem, T. ; Huber, Alex ; Weitz, M. ; Leibfried, D. ; Konig, W. ; Prevedelli, M. ; Dimitriev, S. ; Geiger, H.
Author_Institution :
Max-Planck-Inst. fur Quantenoptik, Garching bei Munchen, Germany
Abstract :
We have measured the absolute frequency of the hydrogen 1S-2S two-photon resonance with an accuracy near 3 parts in 10/sup 12/ by comparing it with the 28/sup th/ harmonic of a methane-stabilized 3.39 /spl mu/m He-Ne-laser. A frequency mismatch of 2 THz at the 7/sup th/ harmonic is bridged with the help of a phase-locked chain of five optical frequency interval dividers.
Keywords :
atomic clocks; frequency measurement; hydrogen neutral atoms; laser frequency stability; measurement by laser beam; measurement standards; optical harmonic generation; optical phase locked loops; resonant states; two-photon processes; 2 THz; 3.39 micron; H; absolute frequency; frequency mismatch; harmonic laser frequency chain; methane-stabilized laser; optical frequency interval divider chain; phase-coherent measurement; phase-locked chain; reference frequency; two-photon resonance; Frequency conversion; Frequency measurement; Hydrogen; Laser stability; Laser theory; Laser transitions; Masers; Optical frequency conversion; Phase measurement; Solid lasers;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 1996 Conference on
Conference_Location :
Braunschweig, Germany
Print_ISBN :
0-7803-3376-4
DOI :
10.1109/CPEM.1996.547330
