Fiber laser device
By using first and second amplifying fibers with the same active elements in a fiber laser device, and combining a beam combiner and an optical attenuator, the transverse mode instability problem caused by the difference in wavelength between the excitation light and the amplified light was solved, achieving stable output of high-power light and improved beam quality.
CN121532914APending Publication Date: 2026-02-13FUJIKURA LTD
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Patent Information
- Application Number
- CN202480047399.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-08-14
- Filing Date
- 2024-08-06
- Publication Date
- 2026-02-13
AI Technical Summary
Technical Problem
In existing fiber laser devices, the difference between the wavelength of the excitation light and the wavelength of the amplified light leads to transverse mode instability, resulting in reduced beam quality and difficulty in high-power light output.
Method used
By adding the same active element to the first and second amplification fibers respectively, unwanted light wavelength propagation is suppressed by a beam combiner and an optical attenuator. Unwanted light wavelengths are reduced by using filters or photonic bandgap fibers, thereby improving beam quality.
Benefits of technology
It achieves stable output of high-power light, suppresses the reduction of beam quality and power loss of excitation source, and improves the efficiency and stability of fiber laser devices.
✦ Generated by Eureka AI based on patent content.
Abstract
A fiber laser device (1) is provided with: a first excitation light source (12) capable of emitting first excitation light; a first amplification optical fiber (11) to which an active element that absorbs the first excitation light is added, and which amplifies and emits the light of the first wavelength; a second amplification optical fiber (21) to which an active element that absorbs the light of the first wavelength and is the same as the active element added to the first amplification optical fiber (11) is added, and which amplifies and emits the light of the second wavelength; beam combiners (31), (32); and a light attenuation unit (60) that is provided on an optical path between the beam combiners (31, 32) and the first amplification optical fiber (11), transmits light from the first amplification optical fiber (11), and suppresses the transmission of light from the beam combiners (31, 32).
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