High-Intensity Resonance on the Simple Vibrator CaF2:H−

The vibrational spectrum for an ${\mathrm{H}}^{-}$ ion on an ${\mathrm{F}}^{-}$ site in Ca${\mathrm{F}}_2$ is that of a perturbed spherical harmonic oscillator. The $\Delta n=1\mathrm{}$ frequencies lie between 928 and 977 ${\mathrm{cm}}^{-1\mathrm{}}$. Tunable C${\mathrm{O}}_2$ lasers have enabled us to study saturation of the single fundamental (0→1) and stepwise excitation to each of the three $n=2\mathrm{}$ levels. A decay-time value $T_1$, based on a crude measurement of the saturation parameter $W$, accounts for the residual linewidth at low temperatures. We discuss "additivity" of stepwise frequencies and polarization "scrambling."