Abstract
Er3+/Dy3+ co-doped double-clad ZBLAN optical fiber has been used to obtain amplified spontaneous emission (ASE) broadband light sources cladding-pumped by 980-nm multimode laser diode (LD) sources. It has been demonstrated that mid-infrared broadband emission extending from 2515 to 3735 nm was obtained by energy transfer between Er3+ and Dy3+. We experimentally investigated the optimum design of Er3+/Dy3+ co-doped ZBLAN fiber in terms of ion concentration, fiber length, pumping configuration, and pumping power. The ASE output power was more than 2.5 mW when the LD pump power was set at 5 W. To assess its potential for gas sensing applications, the fabricated ASE light source was used to successfully detect methane gas with concentrations at 1% and 5%. The simple and stable construction of our ASE light source is suitable for practical purposes.
Highlights
Er3+/Dy3+ co-doped double-clad ZBLAN optical fiber has been used to obtain amplified spontaneous emission (ASE) broadband light sources cladding-pumped by 980-nm multimode laser diode (LD) sources
In mid-IR source without considering efficient light coupling into optical fibers, photoluminescence from Pr3+/Dy3+ co-doped selenide-chalcogenide multimode fiber would be useful, where the light source emits maximum output power of 1 mW within the spectral region 3.5–8 μm under laser diodes operating at 1.470 μm, 1.511 μm and 1.690 μm[14,15]
We experimentally investigated the optimum design of an E r3+/Dy3+ co-doped ZBLAN fiber in terms of ion concentration, fiber length, pumping configuration, and pumping power
Summary
Are applied, such as an end cap for cleaved fiber ends and a cooling apparatus for fiber waveguides. E r3+/Dy3+ co-doped ZBLAN fiber was used to obtain ~ 3-μm amplified spontaneous emission (ASE) broadband light sources cladding-pumped by 980-nm multimode diode sources. Based on these results, the combination of 3 mol% Er3+ and 1 mol% Dy3+ was chosen as the amplification media, considering that a higher doping concentration tends to produce crystallization and quench the concentration. The laser beam of the pump LD with a 105-μm diameter was coupled to the 200-μm cladding of the active fiber through a train of collimating optics with focal lengths of 15 and 20 mm In this experiment, the spectra of the ASE were measured by an optical spectrum analyzer (OSA205C, Thorlabs).
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