Frequency Measurement of an Ar+ Laser Stabilized on Narrow Lines of   Molecular Iodine at 501.7 nm
  A spectrometer for ultra high-resolution spectroscopy of molecular iodine at wave length 501.7 nm, near the dissociation limit is described. Line shapes about 30 kHz wide (HWHM) were obtained using saturation spectroscopy in a pumped cell. The frequency of an Ar+ laser was locked to a hyperfine component of the R(26)62-0 transition and the first absolute frequency measurement of this line is reported. 
Frederic Du Burck (LPL), Christophe Daussy (LPL), Anne Amy-Klein   (LPL), Andrei N. Goncharov (LPL), Olivier Lopez (LPL), Ch...