Abstract
Large-size 0.1 Yb2O3–1.0 Al2O3–98.9 SiO2 (mol%) core glass was prepared by the sol–gel method. Its optical properties were evaluated. Both large mode area double cladding fiber (LMA DCF) with core diameter of 48 µm and large mode area photonic crystal fiber (LMA PCF) with core diameter of 90 µm were prepared from this core glass. Transmission loss at 1200 nm is 0.41 dB/m. Refractive index fluctuation is less than 2 × 10−4. Pumped by 976 nm laser diode LD pigtailed with silica fiber (NA 0.22), the slope efficiency of 54% and “light-to-light” conversion efficiency of 51% were realized in large mode area double cladding fiber, and 81 W laser power with a slope efficiency of 70.8% was achieved in the corresponding large mode area photonic crystal fiber.
Highlights
In recent years, the demands on high-power fiber lasers applied for Inertial Confinement Fusion (ICF) [1] and industrial laser processing application make Yb3+-doped silica fiber laser a hot research area [2,3,4,5]
It has great flexibility to prepare the geometry of silica fiber core and different species of chemicals can be mixed at the molecular scale through the sol–gel process
To the best of our knowledge, this is the highest laser output power report for Yb3+-doped silica large mode area photonic crystal fiber (LMA PCF) prepared by the sol–gel method
Summary
The demands on high-power fiber lasers applied for Inertial Confinement Fusion (ICF) [1] and industrial laser processing application make Yb3+-doped silica fiber laser a hot research area [2,3,4,5]. The fabrication of LMA Yb3+-doped silica fiber needs large size core glass. It challenges the traditional modified chemical vapor deposition process (MCVD) method of active fiber preform. Large-size cores with good doping-homogeneity can be realized by using the sol–gel method. Yb3+-doped silica core glass was prepared using the sol–gel method. Optical–optical efficiency wad realized in Yb3+-doped silica LMA DCF. We acquired 81 W laser output from Yb3+-doped silica LMA PCF, with a slope efficiency of 70.8%. To the best of our knowledge, this is the highest laser output power report for Yb3+-doped silica LMA PCF prepared by the sol–gel method
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