Abstract
Optical fiber lasers operating in the near infrared and visible spectral regions have relied on the spectroscopic properties of rare earth ions such as Yb3+, Er3+, Tm3+, Nd3+, and Sm3+. Here, we investigate Gd3+ doping in phosphosilicate and pure silica fibers using solution doping and sol-gel techniques, respectively, for potential applications in the ultraviolet. Photoluminescence spectra for optical fiber bundles and fiber preforms were recorded and compared. Emissions at 312 nm (phosphosilicate) and 314 nm (pure silica) were observed when pumping to the Gd3+ 6DJ, 6IJ, and 6PJ = 5/2, 3/2 energy levels. Oxygen deficient center was observed in solution doping sample with a wide absorption band centered at around 248 nm not affecting pumping to 6IJ states.
Highlights
Ultraviolet (UV) light sources have found numerous applications in medical science and engineering, such as disinfection, water purification, food manufacturing, UV curing, and lithography,[1,2,3,4] as short wavelengths have relatively high photon energy and provide high resolution
Fiber lasers operating in the near infrared (IR) and visible mostly rely on the spectroscopic properties of rare earth ions.[8]
The dopant concentration along the preform core cross section was measured by energy-dispersive X-ray (EDX) spectroscopy in a sample cut from the fiber preform (Fig. 1(b))
Summary
Ultraviolet (UV) light sources have found numerous applications in medical science and engineering, such as disinfection, water purification, food manufacturing, UV curing, and lithography,[1,2,3,4] as short wavelengths have relatively high photon energy and provide high resolution. Two types of Gd3+-doped fiber samples with a pure silica and a phosphosilicate core were studied.
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