Saturation intensities have been measured for 20 transitions between excited states of argon, krypton, and neon in the 1.3- and 1.5-microm regions. Values of I(sat), corrected for an incident beam with a circular Gaussian intensity profile, range from 20 to 2000 mW/cm(2).
An optogalvanic detection scheme, in conjunction with a single-step pulsed laser excitation has been used to measure the energy of even parity Rydberg levels in krypton. The excitation scheme starts from the 5s(3/2)2 and 5s'(1/2)0 metastable states, which have been populated in a He-Kr discharge tube. Measured energies were compared to either calculated or previously measured values. Calculated energies were obtained with the Rydberg formula using quantum defects extrapolated from the known low-lying levels. Keywords include: Krypton, Rydberg atoms, Atomic spectra, Optogalvanic spectroscopy.
The use of the optogalvanic technique to obtain the line profile of the Cu 5s' 4D5/2 autoionization level with different degrees of saturation broadening is demonstrated. The experimental results point out that the growth of the autoionization-level breadth follows the square root of the increase in the laser intensity. The measured value of the natural breadth of the Cu5s' 4D5/2 autoionization level is 7.2\ifmmode\pm\else\textpm\fi{}0.6 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$. The laser saturation intensity was measured by two different methods, and its value is about 0.39\ifmmode\pm\else\textpm\fi{}0.09 MW/cm2.