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Abstract and Manuscript Management System - Abstract Detail |
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| Speaker: | Mauricio López |
| Title: | Development of Primary Frequency Standards at CENAM |
| Topic Group: | News from the South: Recent Metrology Activities at CENAM |
| E-mail: | mauricio.lopez@cenam.mx |
| Co-Authors: | Mauricio Lopez, Sergio Lopez, Eduardo de Carlos, Maricela Talavera and Nicolay Shtin |
| Abstract: |
The Centro Nacional de Metrologia, CENAM, has developed an optical pumped cesium beam frequency standard, CsOP-1, and is close to complete a cold atoms fountain primary clock, CsF-1. Evaluation of the major systematic frequency shifts in the CsOP-1 has been completed (1). In order to improve its accuracy the linewidth of the central Ramsey fringe has been reduced from 1 kHz up to around 100 Hz. The clock is currently under major changes on its Ramsey Cavity and fractional frequency uncertainty is expected to be in the lower part of the E-14. The CsF-1 clock is under development. DBR diode lasers are used in the optical system of the magneto optical trap (MOT). The MOT is robust against mechanical vibration, acoustic noise and temperature changes in laboratory, since DBR diode lasers do not have an extended cavity aim at reducing the linewidth. Characterization of the MOT as a function of several operation parameters such as intensity of beams, beam diameter and gradient of the magnetic field, has been made. Measurement of the number of trapped Cs atoms in our Cs MOT as been reported (2). Magnetic shielding of the flight region has been designed and built as well as the microwave cavity. Sapphire oscillators have been designed and built (3) to be used as local oscillators for both of the primary frequency standards. Fractional frequency uncertainty on the CsF-1 clock is expected to be in the lower part of the E-15. A broader report of the achieved results will be presented at the Conference. (1) S. López et al, Proc of the CEPM 2002, pp. 454-455 (2) M. Talavera O. et al, Revista Mexicana de Fisica, 53 (5), pp. 358–365 (3) N. A. Shtin, et al, Microwave and Optical Technology Letters, Vol. 49, No 8, pp. 2026-2030, 2007 |
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