Abstract

Recent advances in high power semiconductor laser diode arrays has revived interest in the development of practical upconversion lasers (efficient, power/energy scalable, room temperature operation, etc.). Upconversion lasing in several bulk crystals¹ and glass fibers² doped with various rare earth ions, have been reported. To date, diode-pumpable bulk crystal upconversion lasers have only operated inefficiently at cryogenic temperatures, whereas room temperature fiber upconversion lasers with interesting efficiencies have recently been reported.²,³

© 1991 Optical Society of America