W.P. Risk, W. Lenth
Optics Letters
Green laser emission at 551 nm was achieved in LiYF4: Er3+ by upconversion pumping with a near-infra-red diode laser at low temperature. Using a 2mm-long monolithic laser crystal the lasing threshold was reached with 34 mW of absorbed power from an AlGaAs diode-laser array. © 1989, The Institution of Electrical Engineers. All rights reserved.
W.P. Risk, W. Lenth
Optics Letters
R.W. Olson, H.W.H. Lee, et al.
The Journal of Chemical Physics
R.M. Macfarlane, S. Ushioda, et al.
Solid State Communications
H.M. Kahan, R.M. Macfarlane
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