Radiation-resistant laser optical fiber preform core rod and preparation method therefor

US12001052B2 · kind B2 · utility

Assignee

• Shanghai Institute of Optics And Fine Mechanics, Chinese Academy of Sciences · CN

Inventors

• Chongyun Shao · Shanghai, CN
• Lili HU · Shanghai, CN
• Chunlei Yu · Changzhou City, CN
• Meng Wang · Shanghai, CN
• Yan JIAO · Shanghai, CN
• Lei Zhang · Nanhu, CN
• Shikai Wang · Beijing, CN
• Xiaoqing XU · Lanzhou, CN

Key dates

• Filing date: Jul 1, 2020
• Grant date: Jun 4, 2024
• Expiry date: Nov 6, 2040

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C2203/40
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A radiation-resistant laser optical fiber preform core rod at least includes one type of activated ion (Yb3+, Er3+) and one or more types of co-doped ion (Al3+, P5+, Ge4+, Ce3+, F−), and —OD group of 16-118 ppm. Irradiation resistance of core rod glass can be effectively improved by sequentially performing pre-treatments, i.e. deuterium loading, pre-irradiation and thermal annealing on a preform core rod. Electron paramagnetic resonance test shows that, under the same radiation condition, the radiation induced color center concentration in a preform core rod treated by the method above is lower than in an untreated core rod by one or more orders of magnitude. The obtained core rod can be used for preparing a radiation-resistant rare earth-doped silica fiber, and has the advantages of high laser slope efficiency, low background loss, being able to be used stably in a vacuum environment for a long time, for example.