Abstract

Cw room-temperature upconversion laser operation is reported in Pr:YLF at 640 and 607 nm. An intracavity-pumping scheme that uses a Yb:YAG laser operating at 1030 nm to pump the weak 3H41G4 ground-state transition of Pr:YLF is used to populate the intermediate metastable level. An excited-state absorption at 867 nm is then used to populate the 3P0 and 3P1 upper states. An average output power of 3.5 mW was obtained at 607 nm, with a combined input pump power of 2.5 W.

© 1996 Optical Society of America

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