This paper compares measurement's of the wavelength of an XPL constructed iodine stabilized laser, made in terms of the 86Kr primary standard which were carried out a t the BIPM, with an earlier measurement at KPL. The result of the BIPM measurements for the i component of 12'12 is I (lZ7I2, i) = [632991399.7 t 0.21 fm and differs by only 0.7 fm (1 Y I O P ) from t'he NPL result made on the same laser. The results provide an illustration of the reproducibility of the s6Kr standard which is now considered to be of the order of 4 x and also illustrate the ability of the two laboratories with their different measurement techniques to perform high precision wavelength measurement. Some preliminary beat frequency measurements of the frequency reproducibility of BIPJI and NPL lasers are also reported.
RCsumEDans cet' article, on compare les ritsultats des mesures de la longueur donde d'un laser stabilisit sur l'iode, construit au XPL, faites au BIPRI par comparaison a l'ktalon primaire s6Kr, a ceux de mesures antkrieures faites au XPL.Le ritsultat des mesures faites au BIPM pour la composante i de lZ7I2 est I (lZ7I2, i) = [632991399,7 i 0,2] fm, il differe seulement de 0,7 fm (soit 1 x I O W ) du rksultat obtenu au XPL.Les rbsultats donnent une indication sur la reproductibilitk de l'4talon du 86Kr estimke actuellement b. 4 x IOp9, et montrent aussi l'aptitude des deux laboratoires a effectuer arec des techniques diffkrentes des mesures de longueur d'onde de haute prkcision.On prksente kgalement quelques mesures prkliminaires, par battements, de la reproductibilitit de la fritquence des lasers ronstruits au BIP3I et au S P L .
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