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Proceedings Paper

Excited-state absorption measurements of Tm3+-doped crystals
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Paper Abstract

High resolution, absolute excited-state absorption (ESA) spectra, at room temperature, from the long-lived 3F4 energy level of several crystals doped with trivalent thulium (Tm3+) ions have been measured employing high-brightness narrowband (FWHM <30 nm) light emitting diodes (LEDs) as a probe wavelength. The aim of this investigation was to determine the strength of ESA channels at wavelengths addressable by commercially available semiconductor laser diodes operating around 630-680 nm. The favourable lifetime of the 3F4 manifold and negligible ground-state absorption (GSA) for the red-wavelength second-step excitation, ensures a direct and efficient route for a dual-wavelength pumping scheme of the thulium ion, which will enable blue-green laser emission from its 1G4 upper-laser level.

Paper Details

Date Published: 15 May 2012
PDF: 9 pages
Proc. SPIE 8433, Laser Sources and Applications, 84331O (15 May 2012); doi: 10.1117/12.922673
Show Author Affiliations
J. W. Szela, Optoelectronics Research Ctr., Univ. of Southampton (United Kingdom)
J. I. Mackenzie, Optoelectronics Research Ctr., Univ. of Southampton (United Kingdom)

Published in SPIE Proceedings Vol. 8433:
Laser Sources and Applications
Thomas Graf; Jacob I. Mackenzie; Helena Jelínková; John Powell, Editor(s)

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