Zobrazeno 1 - 10
of 18
pro vyhledávání: '"Yasuki Koga"'
Publikováno v:
IEEE Transactions on Instrumentation and Measurement. 57:2212-2217
The largest source of uncertainty of the optically pumped cesium (Cs) frequency standard (NRLM-4), i.e., the distributed cavity phase shift, was reduced by replacing the microwave cavity with a new ring-type one. An H-bend-type ring cavity is adopted
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::570a3e14f56f0b1279028c56aaa7d32c
https://doi.org/10.1109/tim.2008.922086
https://doi.org/10.1109/tim.2008.922086
Publikováno v:
Proceedings of 20th Biennial Conference on Precision Electromagnetic Measurements.
The optically pumped cesium frequency standard was reconstructed to operate it as a working primary standard at NRLM. The performance and handling are expected to be improved and this article investigates the performance in detail.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dfb642a05d8c3a707b1b51dd162b048e
https://doi.org/10.1109/cpem.1996.547068
https://doi.org/10.1109/cpem.1996.547068
Publikováno v:
1998 Conference on Precision Electromagnetic Measurements Digest (Cat. No.98CH36254).
The optically pumped cesium (Cs) frequency standard at the National Research Laboratory of Metrology, Ibaraki, Japan (NRLM), NRLM-4, was modified in various ways in order to improve frequency stability and accuracy, We determined the frequency stabil
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5ed2b702382e7942e6984c4ddc4f65a7
https://doi.org/10.1109/cpem.1998.699734
https://doi.org/10.1109/cpem.1998.699734
Publikováno v:
IEEE Transactions on Instrumentation and Measurement. 38:1100-1103
The characteristics of microwave-power-dependent frequency shifts of an optically pumped Cs frequency standard are reported. The general features of the shifts are in good agreement with simple theoretical predictions. The shift is quite symmetrical
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f56adf7dee2c0a51ede54a17e2c858ee
https://doi.org/10.1109/19.46408
https://doi.org/10.1109/19.46408
Publikováno v:
IEEJ Transactions on Electronics, Information and Systems. 108:639-644
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d33594b3a08b036f0594db0696f59017
https://doi.org/10.1541/ieejeiss1987.108.9_639
https://doi.org/10.1541/ieejeiss1987.108.9_639
Autor:
S. Ohshima, Leo W. Hollberg, Yasuki Koga, Takeshi Ikegami, Yasuhiro Nakadan, Robert E. Drullinger
Publikováno v:
IEEE Transactions on Instrumentation and Measurement. 38:533-536
Characteristics of an optically pumped Cs frequency standard developed at the National Research Laboratory of Metrology (NRLM) are reported. The short-term frequency stability was estimated to be 1.1*10/sup -12// square root pi when the optical feedb
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cd337c9bc1c246a300a49f6433176cd1
https://doi.org/10.1109/19.192340
https://doi.org/10.1109/19.192340
Publikováno v:
IEEE Transactions on Instrumentation and Measurement. 37:409-413
Describes development of an optically pumped Cs frequency standard aiming at a primary frequency standard. Using this laboratory-type standard, a Ramsey resonance spectrum was observed. It has been shown that a laser power of about 1 mW is almost suf
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b9368d5e1bddc8464122de4e6f05dfa5
https://doi.org/10.1109/19.7465
https://doi.org/10.1109/19.7465
Publikováno v:
Japanese Journal of Applied Physics. 14:1641-1646
The effects of absorption of Rb-D lines are studied with the combination of natural Rb lamps and natural Rb filter cells containing nitrogen at the pressures of 100 Tori and 152 Torr. It is found that the hyperfine components of D lines effective for
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f4b7d222ea987f7da1a035d55b463132
https://doi.org/10.1143/jjap.14.1641
https://doi.org/10.1143/jjap.14.1641
Publikováno v:
Japanese Journal of Applied Physics. 14:591-598
Spectral profiles and radial intensity distributions of the Rb-D1 and D2 lines are measured for electrodeless lamps (carrier gases, Ne, Ar and Kr) excited by high frequency discharge. Observations under various conditions of carrier gases show that t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::545bcb49f7b02041c589329d00890ab6
https://doi.org/10.1143/jjap.14.591
https://doi.org/10.1143/jjap.14.591
Autor:
Yasuki Koga, Yasuhiro Nakadan
Publikováno v:
IEEE Transactions on Instrumentation and Measurement. :133-135
Some causes and cures of frequency uncertainty in the cesium beam frequency standard, NRLM-II, are described. Accuracy reevaluation indicates about 2.2 × 10-13, and the standard frequency is about 8 × 10-14 below that of the International Atomic Ti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::247d7f2b893715d1b3b8067170e8cae1
https://doi.org/10.1109/tim.1985.4315286
https://doi.org/10.1109/tim.1985.4315286