Abstract
ABSTRACTTb3+-doped fluorophosphate glasses with the composition of P2O5–K2O–SrF2–Al2O3–x Tb4O7 (where x = 0.1, 0.5, 1.0, 2.0 and 4.0 mol%) were prepared by a conventional high temperature melt quenching technique and characterized through absorption, emission, excitation and decay measurements. From the emission studies, a strong green emission at around 546 was observed, which corresponds to the 5D4 → 7F5 transition of Tb3+ ion. Green/blue intensity ratios (IG/IB) were evaluated as a function of Tb3+ concentration and vice versa. Higher IG/IB intensity ratio confirms the higher covalency between Tb–O bond and higher asymmetry around the Tb3+ ions in the present fluorophosphate glasses. The decay curves for the 5D4 level of Tb3+ ion were measured and found that they exhibited single exponential nature irrespective to the dopant concentration. The experimental lifetime was determined using single exponential fitting and found that it increased from 2.65 to 2.95 ms when Tb3+ concentration increased from 0.1 mol% to 4.0 mol%. The derived properties were compared to the other Tb3+-doped glasses in order to see the potentiality of the material for visible laser gain media at 546 nm.
Highlights
Visible fiber lasers especially in the green wavelength region have been attracted for the application in medical treatment, optical data storage and visible light communication technologies [1]
GaN-related laser diodes (LDs) from ultraviolet to blue wavelength region have been available on the market in watt level, which promotes the rapid development of visible fiber lasers [10,11,12,13]
Tb3+-doped fluorophosphate glasses for different dopant concentrations were successfully prepared by the conventional melt quenching technique
Summary
Visible fiber lasers especially in the green wavelength region have been attracted for the application in medical treatment, optical data storage and visible light communication technologies [1]. Oxide-based glasses such as silicates, borates, tellurites and phosphates have been attracted due to their much higher mechanical, chemical and thermal stability than fluorides, and usually allow fairly high concentrations of rare earth (RE) dopants. Still these glasses present high phonon energies and OH species at a level that can introduce high losses to the RE’s quantum efficiencies via non-radiative decay processes. On those bases, proper combinations of fluoride and oxide precursors can result in glasses that possess the merits of both types of glasses. The IG/IB and IB/IG intensity ratios and lifetime of 5D4 → 7F6 transition were evaluated and compared with the other Tb3+-doped host matrices
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