Abstract
Eu3+-doped LiYF4 is reexamined as a laser material for the visible spectral region. Polarized absorption and emission cross sections as well as the fluorescence lifetime are determined. Branching ratios and radiative lifetime are calculated within the theory of 4f-4f transition intensities, which takes into account the influence of an excited configuration of the opposite parity 4fN-15d. Continuous-wave laser operation at 702nm is demonstrated with a maximum output power of 15mW and a slope efficiency of 4.6% under pumping with a frequency-doubled Ti:sapphire laser at 393.5nm.
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