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Flint-glass-clad crystalline YAG-core single-mode fiber
Optics Express
|February 20, 2026
Summary
Researchers developed a new glass-clad crystalline fiber using Yttrium Aluminum Garnet (YAG) for advanced lasers. This fiber offers broad single-mode operation, enhancing laser brightness and enabling new applications in medicine.
Area of Science:
- Materials Science
- Optics and Photonics
- Laser Technology
Background:
- Single-mode silica fibers have driven laser advancements, but scaling laser brightness requires crystalline cores while maintaining mode quality.
- Lanthanum-dense flint glasses offer high refractive indices (1.8-1.9), suitable for cladding crystalline cores.
Purpose of the Study:
- To realize a lanthanum-dense-flint-glass-clad crystalline-Yttrium Aluminum Garnet (YAG) core fiber.
- To achieve a broad single-mode wavelength range for enhanced laser performance.
Main Methods:
- Utilized the co-drawing laser-heated pedestal growth method for precision control.
- Engineered the fiber V-number through slow treatment and precise control to ensure the lowest order mode.
- Leveraged the dispersion curves of the glass and YAG core to tune the cut-off wavelength.
Main Results:
- Successfully fabricated a glass-clad YAG-core fiber with tunable cut-off wavelength from 950 nm to 1380 nm.
- Achieved single-mode operation in the broad wavelength range of 1.5 µm to 3 µm.
- Demonstrated control over the fiber V-number for optimal mode quality.
Conclusions:
- The developed single-mode glass-clad crystalline fibers hold significant potential for high-brightness lasers.
- These fibers are promising for medical applications, particularly in eye-safe wavelength ranges.
- The precise control over waveguiding properties enables tailored laser performance.
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