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(Color online) Quenching of luminescence in 10% pumped at and transmitted signal at . Delay of the transmission signal is due to the time constant of the lock-in amplifier, .
Oscillograms obtained for 10% at 650, 850, 1030, and . The curves are vertically shifted for clarity.
(Color online) Emission spectrum from 15% taken at lower power at higher power below (dashed) and above (dotted dash) the threshold of broadband emission at about pump power. The peak at around is the pump. Inset: spectra obtained in 10% ( power) and 20% .
Pyrometric signal at from 10% irradiated at .
(Color online) Signal at and photocurrent from 10% Yb-doped sample pumped at .
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