Blue, green and yellow upconversion lasing in Er:YLiF 4 using 1.5 μm pumping
- 5 November 1992
- journal article
- Published by Institution of Engineering and Technology (IET) in Electronics Letters
- Vol. 28 (23) , 2136-2138
- https://doi.org/10.1049/el:19921371
Abstract
The authors report blue, green and yellow upconversion laser action in Er3+:YLiF4 following pumping at 1.500 μm below 80K. For the blue transition the ratio of the output frequency to the input frequency is 3.3, the highest yet reported for an upconversion laser. In spite of the multiple upconversion steps, the thresholds for laser action were less than 80mW. It is proposed that the nonlinear upconversion pumping proceeds via a sequence of several pairwise cross-relaxation steps.Keywords
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