Absorption spectra of Pr3+ and Nd3+ diluted in LuPO4 and YPO4 crystals have been measured from 4000 to 30 000 cm−1, at liquid He and N2 temperatures. Fluorescence was observed for Pr3+ and Nd3+ in YPO4, and Zeeman spectra were obtained in the visible region. The transitions were assigned and fit to a semiempirical Hamiltonian with adjustable parameters via a least squares procedure. Satisfactory fits and reasonable agreement between calculated and measured g values were obtained.
The optical and near infrared absorption of dilute Tm 3 + and Yb 3 + impurities in YP0 4 and LuP0 4 single crystals have been measured at 1 iquid helium and nitrogen temperatures. For Tm 3 +, the spectral region from 5000 to 38,000 cm-1 was examined and Zeeman spectra were obtained in the visible region. The observed transitions were assigned and fit to a semiempirical Hamiltonian with adjustable parameters via a leastsquares procedure. Satisfactory fits and gooa agreement between the calculated and measured g values were obtained.For Yb 3 +, there are more parameters than experimental levels, so s, B6, B6, and B~ were adjusted, while Bg and B~ were fixed at the values found. for Tm 3 +. Energy levels and Zeeman splittings calculated with these parameters are in good agreement with the measured quantities.
The absorption spectra of Er3+ diluted in LuPO4 and HfSiO4 crystals have been measured from 6000 to 28 000 cm−1 at liquid He and N2 temperatures. Zeeman spectra were obtained in the visible region. The transitions were assigned and fitted to a semiempirical Hamiltonian with ten adjustable parameters. Satisfactory fits were obtained including reasonable agreement between calculated and measured g values.
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