Direct phase-coherent measurements of the absolute frequency of the 11-5, R(127) transition in 127I2 at 633 nm of the BIPM4 He–Ne laser have been made. This laser has been used as a reference laser for a large number of international comparisons over the years and, as such, has served as the connecting point for the national implementation of the SI metre in the member states of the Metre Convention. The frequency value found for the f-component was 473 612 353 605.4 kHz with a combined uncertainty of 1.8 kHz, a value in close agreement with the value adopted for this radiation in the list of recommended radiations for the realization of the metre, which is 473 612 353 604 kHz.
Direct measurement of the absolute frequency of the international reference laser BIPM4 / Ma, Ls; Picard, S; Zucco, Massimo; Chartier, Jm; Robertsson, L; Windeler, Rs. - In: METROLOGIA. - ISSN 0026-1394. - 41:1(2004), pp. 65-68. [10.1088/0026-1394/41/1/009]
Direct measurement of the absolute frequency of the international reference laser BIPM4
ZUCCO, MASSIMO;
2004
Abstract
Direct phase-coherent measurements of the absolute frequency of the 11-5, R(127) transition in 127I2 at 633 nm of the BIPM4 He–Ne laser have been made. This laser has been used as a reference laser for a large number of international comparisons over the years and, as such, has served as the connecting point for the national implementation of the SI metre in the member states of the Metre Convention. The frequency value found for the f-component was 473 612 353 605.4 kHz with a combined uncertainty of 1.8 kHz, a value in close agreement with the value adopted for this radiation in the list of recommended radiations for the realization of the metre, which is 473 612 353 604 kHz.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
