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Strategic Study of CAE >> 2007, Volume 9, Issue 6

Microwave-Optical Frequency Standards at NIM:Realizing of Definition of Metre and Second

National Institute of Metrology ( NIM) , Beijing   100013, China

Funding project:科技部基础研究资助项目(G99-B-14,2001-DEA-12) Received: 2007-03-05 Revised: 2007-03-13

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Abstract

  The paper presents the realization,  at NIM,  of SI time unit second using the NIM4 cesium fountain clock,  SI length unit meter using a femto-second (FS) optical frequency comb and calibration of wavelengths of stabilized lasers by this FS comb. The uncertainty of NIM4 fountain clock was evaluated as 5 × 10 - 15.  The frequency uncertainty of the FS optical comb locked to a H-maser, which is steered by NIM4 clock,  was estimated as 2. 2 × 10 - 14.  The function,  significance of Cs fountain clock, stabilized lasers,  optical comb and relationship among them are discussed. Finally the progress of NIM5 fountain clock and the construction of a Sr atom optical clock started in 2006 at NIM are reported.

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