Infrared and optical frequency standards


  • V. P. Chebotayev


The properties of stable lasers are discussed. Consideration is given to the methods of production of lasers with a very narrow linewidth of about 0.5 Hz and to their use in achieving high values of long-term frequency stability and reproducibility. The results of investigations of frequency stability of a He-Ne laser with a methane absorbant and a telescopic beam expander are presented.