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Proceedings Paper

Compact erbium 3-um crystal lasers for medical applications
Author(s): Markus Pollnau; R. Spring; S. Wittwer; Willy A.R. Luethy; Heinz P. Weber
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Paper 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.

Paper Details

Date Published: 8 January 1996
PDF: 8 pages
Proc. SPIE 2629, Biomedical Optoelectronics in Clinical Chemistry and Biotechnology, (8 January 1996); doi: 10.1117/12.229517
Show Author Affiliations
Markus Pollnau, Univ. Bern (Switzerland)
R. Spring, Univ. Bern (Switzerland)
S. Wittwer, Univ. Bern (Switzerland)
Willy A.R. Luethy, Univ. Bern (Switzerland)
Heinz P. Weber, Univ. Bern (Switzerland)

Published in SPIE Proceedings Vol. 2629:
Biomedical Optoelectronics in Clinical Chemistry and Biotechnology
Stefan Andersson-Engels; Mario Corti; Ivan Kertesz; Norbert Kroo; Heinz P. Weber; Terence A. King; Riccardo Pratesi; Stefan Seeger, Editor(s)

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