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Upconversion versus Pr-deactivation for efficient 3 μm laser operation in Er

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2 Author(s)
Knowles, D.S. ; Centre for Lasers & Appl., Macquarie Univ., NSW, Australia ; Jenssen, H.

Erbium-doped BaY2F8 is evaluated as a potential material for a laser diode pumped 3-μm laser. It is shown that the metastable Er4I13/2 level is efficiently quenched by the addition of a small amount of Pr, while still leaving the 4I11/2 lifetime fairly long. Measurement of the 4I11/2 and 4I13/2 lifetimes in Er, Pr:BaY2F8 for 1-100% Er with 0.1-1% Pr show that the 4I13/2 lifetime can be up to 10 times shorter than 4I11/2. To compare this with upconversion type operation of this laser, the authors measured the upconversion coefficients α for 5, 10, 20, 50, and 100% Er:BaY2F8 and compared these to previous measurements for LiYF4. These show a similar concentration dependence in both hosts, although BaY2F8 appears to have a slightly higher ratio of α13/2 to α11/2. Laser performance under argon and diode pumping are presented to compare upconversion operation in BaY2F8 and LiYF4, and quasi-4-level operation in Er, Pr:LiYF4 laser

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Quantum Electronics, IEEE Journal of  (Volume:28 ,  Issue: 4 )