Investigations on the slope efficiency of a pulsed 2.8-µm Er3+:LiYF4 laser

Markus Pollnau, R. Spring, S. Wittwer, W. Lüthy, H.P. Weber

    Research output: Contribution to journalArticleAcademicpeer-review

    31 Citations (Scopus)
    108 Downloads (Pure)


    A slope efficiency of 40% from an Er3+:LiYF4 laser is demonstrated under pulsed Ti:sapphire pumping at 973 nm. With reduction of the pump-pulse duration a significant decrease of the slope efficiency and an increase of the threshold is observed in the experiment and confirmed with high accuracy in a computer simulation. This behavior is due to interionic upconversion from the lower laser level, which leads to energy recycling into the upper laser level. The upconversion rate is negative at threshold but increases strongly with rising pump pulse energy, thus enhancing the slope efficiency. The conditions are derived that are necessary for achieving the high slope efficiency of the energy-recycling regime.
    Original languageUndefined
    Article number10.1364/JOSAB.14.000974
    Pages (from-to)974-978
    Number of pages5
    JournalJournal of the Optical Society of America. B: Optical physics
    Issue number4
    Publication statusPublished - 1997


    • IOMS-APD: Active Photonic Devices
    • IR-70108
    • EWI-17574

    Cite this