Title :
Frequency shift of iodine stabilized He-Ne laser at higher order harmonic stabilization
Author :
Hu, J. ; Ahola, T. ; Ikonen, E. ; Riski, K.
Author_Institution :
Metrol. Res. Inst., Helsinki Univ. of Technol., Espoo, Finland
Abstract :
The frequency shifts of an /sup 127/I/sub 2/ stabilized He-Ne laser were measured at the 3rd, 5th and 7th harmonic stabilization using a digital signal processing lock-in amplifier. The observed harmonic-order-related frequency shift confirmed the previous theoretical prediction that the center frequency of the iodine molecule transition is higher than the corresponding optical frequency of the iodine stabilized He-Ne laser. Use of the 5th instead of 3rd harmonic stabilization would reduce the frequency shifts caused by variation of modulation amplitude, intracavity power and iodine pressure, and improve the frequency reproducibility of the laser standard.
Keywords :
amplitude modulation; gas lasers; helium; iodine; laser frequency stability; measurement standards; neon; optical modulation; units (measurement); /sup 127/I/sub 2/ stabilized He-Ne laser; 633 nm; He-Ne; I/sub 2/; digital signal processing lock-in amplifier; frequency reproducibility; frequency shifts; harmonic-order-related shift; higher order harmonic stabilization; intracavity power variation; laser standard; metre definition; modulation amplitude variation; Digital signal processing; Frequency measurement; Laser stability; Laser theory; Laser transitions; Optical amplifiers; Optical modulation; Optical signal processing; Power system harmonics; Stimulated emission;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 1996 Conference on
Conference_Location :
Braunschweig, Germany
Print_ISBN :
0-7803-3376-4
DOI :
10.1109/CPEM.1996.546769
