Compact erbium 3-um crystal lasers for medical applications

Markus Pollnau; R. Spring; S. Wittwer; Willy A.R. Luethy; Heinz P. Weber

doi:10.1117/12.229517

8 January 1996 Compact erbium 3-um crystal lasers for medical applications

Markus Pollnau, R. Spring, S. Wittwer, Willy A.R. Luethy, Heinz P. Weber

Proceedings Volume 2629, Biomedical Optoelectronics in Clinical Chemistry and Biotechnology; (1996) https://doi.org/10.1117/12.229517
Event: BiOS Europe '95, 1995, Barcelona, Spain

Abstract

The limit of the slope efficiency with respect to absorbed pump power is investigated in erbium-doped 3-micrometer crystal lasers. It depends on the major population mechanisms of the system. Fluoride hosts are favorable due to the long lifetime of the upper laser level. The calculated slope efficiency in Er:YLF approaches 56% when pumping at 970 nm. This value clearly exceeds the Stokes limit of 35% because of energy recycling via interionic upconversion. A laser slope efficiency of 40% in Er(15%):YLF is experimentally obtained under Ti:sapphire pumping.

Citation Download Citation

Markus Pollnau, R. Spring, S. Wittwer, Willy A.R. Luethy, and Heinz P. Weber "Compact erbium 3-um crystal lasers for medical applications", Proc. SPIE 2629, Biomedical Optoelectronics in Clinical Chemistry and Biotechnology, (8 January 1996); https://doi.org/10.1117/12.229517

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