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Proceedings Paper

Upconversion-pumped IR (2.8-2.9 microns) lasing of Er3+ in garnets
Author(s): S. A. Pollack; David B. Chang; Milton Birnbaum; Milan R. Kokta
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Paper Abstract

Optical properties and upconversion-pumped lasing on the 4I11/2 4I13/2 transition of the Er3+ ion were studied in two garnet crystals, (33% Er) Y3Al5O12 and (25%) Y3Sc2Ga3O12. The (Er) YSGG crystal was grown at Union Carbide. Absorption and emission spectra of the crystals were studied at 300K, 77K and 4K. Stark-splittings were determined from the 4K absorption spectra for the five lowest excited states. Fluorescence lifetimes for several excited states were measured at 300K and 77K using 355 nm 10 ns Q-switch pulses of tripled Nd:YAG; and 1.53 micrometers pulses of an Er:glass laser. In the latter case, fluorescence was excited via ion-pair upconversion. In (Er)YAG at 300K under UV excitation, the lifetime of the 4I13/2 state is almost two orders of magnitude longer than the lifetime of the 4I13/2 in Er:YSGG. The lifetime of the 4I13/2 state is only a factor of 5 longer than the 4I11/2 state. The upconversion lasing characteristics of Er:YSGG and Er:YAG are described and related to the measured spectral and lifetime measurements.

Paper Details

Date Published: 1 July 1991
PDF: 9 pages
Proc. SPIE 1410, Solid State Lasers II, (1 July 1991); doi: 10.1117/12.43596
Show Author Affiliations
S. A. Pollack, Optitron (United States)
David B. Chang, Hughes Aircraft Co. (United States)
Milton Birnbaum, Univ. of Southern California (United States)
Milan R. Kokta, Union Carbide Corp. (United States)

Published in SPIE Proceedings Vol. 1410:
Solid State Lasers II
George Dube, Editor(s)

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