A cladding light filter based on chirped tilted grating and its preparation method

By writing chirped inclined gratings in the second half of the optical fiber cladding, the low numerical aperture cladding light is reflected into high numerical aperture cladding light, and multiple reflections and scattering are performed on the cladding optical filter removal layer, the problem of poor optical filtering effect of low numerical aperture cladding in the prior art is solved, and the peel ratio and beam quality of the cladding optical filter are significantly improved.

CN119200084BActive Publication Date: 2025-05-02LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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Patent Information

Application Number
CN202411745328.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-12-02
Publication Date
2025-05-02
Estimated Expiration
2044-12-02

AI Technical Summary

Technical Problem

The existing cladding optical filter has poor filtering effect on low numerical aperture cladding light, which makes it difficult to guarantee the beam quality and stability of high-power fiber lasers.

Method used

A cladding optical filter based on chirped inclined grating is adopted. By writing the chirped inclined grating in the second half of the fiber cladding, the low numerical aperture cladding light is reflected into high numerical aperture cladding light, and multiple reflections and scattering are performed on the cladding optical filtering layer to achieve high-efficiency filtering of the low numerical aperture cladding light.

Benefits of technology

The peel ratio of the cladding optical filter to the low numerical aperture cladding light is significantly improved, and the beam quality and stability guarantee for high-power laser systems is enhanced.

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Abstract

The present application discloses a cladding light filter based on a chirped tilted grating and a preparation method thereof, and relates to the technical field of cladding light filtering. The cladding light filter comprises: an optical fiber core, an optical fiber cladding, a cladding light filtering layer, and a chirped tilted grating inscribed on the rear half of the optical fiber cladding covered by the cladding light filtering layer; the pump cladding light of different bands is coupled back and reflected into the air to filter the pump cladding light, and at the same time, the low numerical aperture pump cladding light of each band is reflected to become a high numerical aperture pump cladding light, which is reflected and scattered multiple times on the surface of the cladding light filtering layer to filter the low numerical aperture pump cladding light. The above scheme of the present application uses a chirped tilted grating to convert the low NA pump cladding light into the reversely transmitted high NA pump cladding light, so that the pump cladding light can be easily filtered regardless of the high or low NA, thereby improving the stripping ratio of the cladding light filter.
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Citation Information

Patent Citations

  • Optical fiber, optical fiber structure and forming method thereof

    CN118244414A

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