The 2.8μm laser properties of Er3+ doped CaF2 crystals

Abstract Laser emission at 2.8 μm in Er3+:CaF2 crystals is analysed for different excitation pump wavelengths: 800, 968 and 1545 nm. The best laser performance is obtained for 968 nm Ti:sapphire laser excitation with an absorbed pump power at threshold of 23 mW and a slope efficiency of 30%. Laser emission under 1545 nm excitation into the terminal level 4 I 13/2 of the laser transition is obtained due to efficient upconversion energy transfers.

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