Abstract

We report room-temperature continuous-wave upconversion laser emission on the green transition S43/2I415/2 in Er(1%),Yb(3%):YLiF4 at 551  nm. Green laser operation was obtained for titanium–sapphire pump wavelengths continuously tunable between 955 and 974.5  nm. Codoping with Yb3+ resulted in a more efficient excitation of the upper laser level by upconversion processes. The maximum green laser output power was 37  mW at an incident titanium–sapphire pump power level of 1580  mW at 966  nm.

© 1997 Optical Society of America

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