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<title>Excited-state absorption at 980 nm in erbium-doped glass</title>

1992; SPIE; Volume: 1581; Linguagem: Inglês

10.1117/12.134972

1996-756X

R. S. Quimby, W. J. Miniscalco, Barbara A. Thompson,

Laser Material Processing Techniques

Excited state absorption (ESA) spectra were measured for the 4I11/2? 4F7/2 transition at 980 nm in Er-doped fluoride and fluorophosphate glass, by varying the pump wavelength from a tunable Ti:sapphire laser and monitoring the relative strength of the green upconverted fluorescence. The ESA cross section spectra are the same order of magnitude in strength as the 980 nm ground state absorption, but shifted to shorter wavelength by 4-6 nm. The 980 nm ESA may limit the efficiency of high power erbium-doped fiber amplifiers, and provides a possible pump mechanism for IR upconversion pumped fiber lasers operating in the visible.