A thulium-doped optical fiber and a method for manufacturing the same
By designing concentric doping layers and graded doping concentrations in thulium-doped fibers, and combining low-refractive-index and high-refractive-index layers, the absorption and thermal management problems of optical fibers under high power were solved, achieving high-efficiency and high-beam-quality laser output and enhancing the fiber's resistance to bending.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- XIAN INST OF OPTICS & PRECISION MECHANICS CHINESE ACAD OF SCI
- Filing Date
- 2026-03-31
- Publication Date
- 2026-06-09
AI Technical Summary
Existing thulium-doped fibers have difficulty improving absorption coefficients under high-power operation, resulting in severe fiber heating at the front end, significant nonlinear effects, and degraded beam quality, making it difficult to meet the requirements of high efficiency and high beam quality.
A thulium-doped optical fiber is designed with a 12-40 layer concentric doping layer structure. The Tm3+ and Nd3+ doping layers are alternately distributed radially, and the doping concentration of the fiber core is gradually varied along the axial direction. Combined with the design of low refractive index and high refractive index layers, the fiber is fabricated by chemical vapor deposition and sleeve process to achieve multi-segment axially varied absorption coefficient and refractive index distribution.
It improves the pump light absorption efficiency of optical fiber, reduces front-end heating, optimizes heat distribution, realizes high-efficiency and high-beam-quality laser output at high power, and enhances the bending resistance of optical fiber.
Smart Images
Figure CN122172373A_ABST