551 nm diode-laser-pumped upconversion laser
2000
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.
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