Title :
International comparison of /sup 127/I/sub 2/-stabilized He-Ne lasers at /spl lambda/=633 nm using the third and/or the fifth harmonic locking technique
Author :
Balling, P. ; Blabla, J. ; Ziegler, M. ; Chartier, A. ; Chartier, J.-M.
Author_Institution :
Inst. of Metrol., Prague, Czech Republic
fDate :
June 27 1994-July 1 1994
Abstract :
An international comparison has been carried out of /sup 127/I/sub 2/-stabilized helium-neon lasers at /spl lambda/=633 nm from the CMI and the BIPM using the beat frequency technique. The lasers were stabilized by the third (THT) and/or the fifth (FHT), harmonic locking technique. Using the FHT, the frequency of lasers is shifted to higher frequencies. An iodine cell designated JM-03 was used to evaluate the frequency shifts produced by weaker components of the rotational-vibrational transition P(33) 6-3 in the mixed molecule /sup 127/I/sup 129/I. Laser comparison shows that the frequencies of components d, e, f, g of the R(127) 11-5 of the molecule /sup 127/I/sub 2/ are very strongly influenced by the weaker spectrum of components of the mixed molecule.<>
Keywords :
frequency measurement; gas lasers; iodine; laser frequency stability; laser mode locking; laser transitions; measurement standards; /sup 127/I/sub 2/-stabilized He-Ne lasers; /sup 127/I/sup 129/I; 633 nm; He-Ne; I/sub 2/; I/sub 2/-He-Ne; JM-03; P(33); R(127); beat frequency technique; fifth harmonic locking; frequency shifts; international comparison; mixed molecule; rotational-vibrational transition; third harmonic locking; Amplitude modulation; Fluorescence; Frequency; Impurities; Laser stability; Pollution measurement; Power lasers; Programmable logic arrays; Reproducibility of results; Testing;
Conference_Titel :
Precision Electromagnetic Measurements, 1994. Digest., 1994 Conference on
Conference_Location :
Boulder, CO, USA
Print_ISBN :
0-7803-1984-2
DOI :
10.1109/CPEM.1994.333375
