Title :
Recent progress on the 28/29 THz CO/sub 2//OsO/sub 4/ LPTF frequency standard
Author_Institution :
Obs. de Paris, France
Abstract :
In this paper we report recent progress on metrological performances of the LPTF CO/sub 2/ frequency standard in the 28/29 THz range, using OsO/sub 4/ molecules as frequency reference. Significant improvements of both short-term (7.10/sup -14///spl radic//spl tau/ for /spl tau/<300 s) and long-term stability (3.10/sup -15///spl radic//spl tau/ up to /spl tau/=4000 s) are obtained. The reproducibility (over more than one year) is about 4.10/sup -13/ at present time.
Keywords :
carbon compounds; frequency measurement; gas lasers; laser beam applications; laser frequency stability; measurement standards; osmium compounds; 28 to 29 THz; 300 s; 4000 s; CO/sub 2/; CO/sub 2/ frequency standard; CO/sub 2/-OsO/sub 4/; CO/sub 2//OsO/sub 4/ frequency standard; LPTF frequency standard; OsO/sub 4/; OsO/sub 4/ molecules; frequency reference; long-term stability; reproducibility; short-term stability; Electromagnetic wave absorption; Fabry-Perot; Frequency; Laser transitions; Masers; Measurement standards; Optical saturation; Performance evaluation; Reproducibility of results; Stability;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 1996 Conference on
Conference_Location :
Braunschweig, Germany
Print_ISBN :
0-7803-3376-4
DOI :
10.1109/CPEM.1996.547095
