A yttrium aluminosilicate glass fiber with graded refractive index fabricated by melt‐in‐tube method

Abstract

A graded-index fiber with yttrium aluminosilicate (YAS) glass core was fabricated by a "Melt-in-Tube" method. The refractive index and stress profiles of the fibers exhibit a highly symmetrical gradient tendency along the radial axis which is in accordance with the results of element migration. Based on the formation mechanism of YAS glass core, the relationships between the refractive index/stress profile and the spontaneous migration are discussed. A linear all-fiber laser based on the obtained fiber shows a laser output threshold of 11.48 mW and slope efficiency of 8.3%. The near-field beam intensity distribution of fiber laser with spectrum FWHM of 0.24 nm indicates the good laser beam quality. The facile "Melt-in-tube" method was proved to be reliable in designing graded-index fiber through the dissolution and diffusion process, which is more advanced than commonly used "Rod-in-tube" method.

The preparation of Yttrium Aluminosilicate (YAS) Glass Fiber with heavy doping of Tm3+ from Polycrystalline YAG ceramics

“…Our previous work confirmed the reliability of this facile “Melt‐in‐Tube” method in fabricating graded‐index fiber . In this work, YAG ceramics with different doping concentrations of Tm 3+ were utilized as a precursor material for preparation of optical fiber by the MIT method.…”

Multi‐component yttrium aluminosilicate (YAS) fiber prepared by melt‐in‐tube method for stable single‐frequency laser

“…As there was no Si in the core of the pristine YAG/silica preform, the elemental migration of Si (~ 38 wt% of Si at the core center) was caused by the highly non‐equilibrium fiber drawing condition. All those elements show a gradual change trend, which led to a gradual refractive index profile around the fiber core (provided as the Figure ).…”

Microstructure and Faraday effect of Tb2O3‐Al2O3‐SiO2‐B2O3 glasses for fiber‐based magneto‐optical applications

“…Especially, yttrium aluminosilicate (YAS) glass attracts the attention of researchers and YAS fibers doped with different rare-earth ions have been applied to fiber lasers including single-frequency and mode-locked fiber lasers. [13][14][15][16][17] The YAS glasses and their optical fiber analogs are considered to be capable of realizing a high doping of rare-earth ions while maintaining good compatibility with silica glass fiber systems from a point of view of refractive index and thermal expansion coefficient. Those features also predict their advantages as fiber-based MO devices.…”

“…Starting from the same perspective, aluminosilicate glasses are considered to be a candidate with a good overall performance for fiber‐related MO applications. Especially, yttrium aluminosilicate (YAS) glass attracts the attention of researchers and YAS fibers doped with different rare‐earth ions have been applied to fiber lasers including single‐frequency and mode‐locked fiber lasers 13–17 . The YAS glasses and their optical fiber analogs are considered to be capable of realizing a high doping of rare‐earth ions while maintaining good compatibility with silica glass fiber systems from a point of view of refractive index and thermal expansion coefficient.…”