Title :
Frequency shifts of iodine stabilized He-Ne lasers at higher harmonic order stabilization
Author :
Hu, Jianpei ; Ahola, Tom ; Ikonen, Erkki ; Riski, Kari
Author_Institution :
Metrol. Res. Inst., Helsinki Univ. of Technol., Espoo, Finland
fDate :
4/1/1997 12:00:00 AM
Abstract :
The frequency shifts of an 127I2 stabilized He-Ne laser at 633 nm have been measured at the third, fifth, and seventh harmonic stabilization using a digital signal processing lock-in amplifier. The observed frequency shifts confirmed the previous theoretical prediction that the laser frequency depends on the harmonic order of stabilization. The lower effects of modulation amplitude shift, power shift, and iodine pressure shift at the fifth harmonic stabilization indicate a potential improvement of the frequency reproducibility of the laser standard. A model is suggested to describe the power shifts of the laser. The mechanism explains the lower power shift of some lasers when they are operated at relatively high intracavity power
Keywords :
frequency measurement; gas lasers; helium; iodine; laser frequency stability; laser variables measurement; measurement standards; neon; optical harmonic generation; optical saturable absorption; spectral line broadening; spectral line shift; 633 nm; 127I2 stabilized He-Ne laser; He-Ne; I2; digital signal processing lock-in amplifier; fifth harmonic stabilization; frequency reproducibility; frequency shifts; harmonic order; higher harmonic order stabilization; iodine pressure shift; laser frequency; laser standard; modulation amplitude shift; power broadening; power shift; relatively high intracavity power; saturated absorption; seventh harmonic stabilization; third harmonic stabilization; Amplifiers; Amplitude modulation; Digital signal processing; Frequency measurement; Laser mode locking; Laser modes; Laser stability; Laser theory; Power lasers; Power system harmonics;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
