Highly efficient Yb-doped silica fibers prepared by powder sinter technology

Abstract

We report on the characteristics of an active fiber with core material made by sintering of Yb-doped silica powders as an alternative to a conventional modified chemical vapor deposition (MCVD) technique. This material provides the possibility to design very large and homogenously rare-earth doped active fiber cores. We have determined a fiber background attenuation of 20 dB/km and measured a slope efficiency of 80%. These values are comparable to established fibers made by MCVD technology.

Fabrication and laser performance of Yb3+/Al3+ co-doped photonic crystal fiber synthesized by plasma nonchemical vapor deposition method

“…The laser threshold is 1.42 W from the linear fitting. Comparing with the reported results in Yb 3+ /Al 3+ co-doped fiber fabricated using the other methods [10,12,14,15], the slope efficiency is low. The low slope efficiency may be due to two possibilities.…”

“…At present, most of available RE-doped fibers are fabricated by the combination of modified chemical vapor deposition (MCVD) and solution doping. However, the problems such as homogeneity deteriorate, addition interfaces, and small active core in MCVD restrict its applications [9][10][11][12][13]. Thus, some new fabrication techniques are developed for preparing the bulk high-RE-doped silica material [14][15][16][17][18].…”

Effects of F− on the optical and spectroscopic properties of Yb3+/Al3+-co-doped silica glass

“…Generally, Yb 3+ ions need to be added with Al 3+ ions in silica glass to improve solubility and maintain laser efficiency [3,[7][8][9]. However, Yb 3+ and Al 3+ ions incorporated into silica glass will increase the refractive index of the fiber core [3,10], resulting in high core numerical aperture (NA) and deteriorating the laser beam output quality of the large mode area fiber.…”

Glass and Process Development for the Next Generation of Optical Fibers: A Review

“…With this technique, it is possible to prepare very large and homogeneously-doped active fiber cores. Fiber with a background attenuation of 20 dB/km and with a slope efficiency of 80% was reported in [34]. Fibers with similar laser efficiencies as fibers produced by the MCVD/solution doping technology were fabricated using the REPUSIL process [30].…”