Abstract

Room-temperature green upconversion fluorescence of an Er3+-doped POCl3–SnCl4 solution is achieved when the solution is pumped with an 800-nm GaAs laser diode. The upconversion emission at 550 nm is determined to be the result of a two-step absorption process. Numerical analysis reveals that laser systems that employ this erbium-doped laser liquid should be realizable with threshold pump powers as low as 45 mW.

© 1996 Optical Society of America

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