(a) Typical normalized TL signal for the Er4LP sample with excitation at 980 nm. (b) Thermal lens phase shift as a function of the incident power for the ErxLP samples under excitation at 980 nm.
Thermal diffusivity versus the Er3+ concentration for the ErxLP samples.
Thermal lens phase shift divided by the absorbed pump power versus the normalized lifetime, Γ, for low pump power at 980 nm.
Fluorescence quantum efficiency of the 4I13/2 level as a function of the Er3+ concentration. The line is shown as a guide to the eye.
(a) Typical emission of the samples under excitation at 488 nm. The two maxima were normalized. (b) Simplified energy level diagram for Er3+ ions with excitation at 488 and low-pump power.
(a) Typical TL transient for the Er2LP sample under excitation at 488 nm and with a pump power of 29 mW. The solid line is the fit using the TL equation from which the values θ = −(0.02887 ± 0.00006) rad and tc = (1.83 ± 0.01) ms were obtained. (b) TL phase shift as a function of excitation power at 488 nm for the ErxLP samples.
(a) Fractional thermal load for excitation at 488 nm and (b) fluorescence quantum efficiency of the level 4S3/2 + 2H11/2 as a function of Er3+ concentration.
Optical and thermal parameters of the samples investigated.
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