Efficient and Broadband Emission in Dy3+-Doped Glass-Ceramic Fibers for Tunable Yellow Fiber Laser

Abstract

Yellow lasers are of great interest in biology, medicine and display technology. However, nonlinear emission of near-infrared lasers at yellow still presents particularly complex optical alignment to date. Here, to the best of our knowledge, we demonstrate the fabrication of a NaLa(WO4)2: Dy3+ glass-ceramic fiber (GCF) for the first time. More importantly, the emission band of the GCF, which is around 575 nm, has a wide full-width half maximum (FWHM) of 18~22 nm, which is remarkably larger than that of the Dy3+-doped YAG crystal (<7 nm). The precursor fiber (PF) was drawn using the molten core drawing (MCD) method. In particular, benefiting from the in situ nanocrystals fabricated in the amorphous fiber core after thermal treatment, the resultant glass-ceramic fiber exhibits a five-times enhancement of luminescence intensity around 575 nm, compared with the precursor fiber, while retaining its broadband emission. Overall, this work is anticipated to offer a high potential GCF with prominent bandwidth for the direct access of a tunable yellow laser.

Analysis and Optimization of Dysprosium-Doped Yellow Fiber Lasers for Ophthalmology Applications

“…Fluoride fibers have been recently employed to build novel Mid-IR sources as well [21], [22]. Furthermore, in [23], another Dy−doped NaLa(WO 4 ) 2 glass ceramic fiber with good uniformity was fabricated using the molten core method showing that it can be a very promising material candidate for tunable yellow lasers [23]. Despite these positive results in the fabrication technology of new glasses, the most promising commercially available Dy−doped ZBLAN fiber is the one produced by Le Verre Fluoré, France [24].…”