Single-frequency polarization-maintaining narrow-linewidth optical fiber amplifier

By employing a step-by-step amplification structure consisting of a seed laser, a preamplifier, and a double-clad amplifier, combined with a tilting grating and a clad pump stripper, the problems of low side-mode suppression ratio and high noise in existing 1012nm–1020nm high-power single-frequency polarization-maintaining fiber amplifiers have been solved, achieving high-power, low-cost, and highly stable laser output.

CN224153759UActive Publication Date: 2026-04-21SHANGHAI KENAITE LASER TECH CO LTD
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Patent Information

Application Number
CN202521231368.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-06-16
Publication Date
2026-04-21
Estimated Expiration
2035-06-16

AI Technical Summary

Technical Problem

Existing 1012nm–1020nm high-power single-frequency polarization-maintaining fiber amplifiers suffer from low side-mode rejection ratios and high noise levels due to the lack of suitable narrowband filters, which limits their application. Furthermore, traditional solutions are costly and prone to optical path damage.

Method used

A step-by-step amplification structure consisting of a seed laser, a preamplifier, a first-stage double-clad amplifier, and a second-stage double-clad amplifier is adopted to achieve high-power laser output through step-by-step amplification. Spontaneous emission light is filtered out by using a tilting grating and a clad pump stripper, and the optical path design is optimized to improve the side-mode suppression ratio and reduce noise.

Benefits of technology

It achieves 10W high-power laser output, improves side-mode suppression ratio, reduces signal-to-noise ratio, reduces cost, and improves optical path stability, meeting the requirements of low noise and high polarization extinction ratio.

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Abstract

The utility model discloses a single-frequency polarization-maintaining narrow-linewidth optical fiber amplifier, which comprises a seed laser, a pre-amplifier, a first-stage double-clad amplifier and a second-stage double-clad amplifier, the output end of the seed laser is connected with the input end of the pre-amplifier through an optical fiber, the output end of the pre-amplifier is connected with the input end of the first-stage double-clad amplifier through an optical fiber, and the output end of the first-stage double-clad amplifier is connected with the input end of the second-stage double-clad amplifier through an optical fiber; the seed laser is used for generating seed laser; the pre-amplifier is used for performing primary amplification on the seed laser to obtain primary amplified laser with first power and outputting the primary amplified laser; the first-stage double-clad amplifier is used for carrying out second-stage amplification on the first-stage amplified laser to obtain second-stage amplified laser with second power and outputting the second-stage amplified laser; and the second-stage double-clad amplifier is used for performing three-stage amplification on the second-stage amplified laser to obtain and output the amplified laser with the target power. By means of the structure, high-power laser output is achieved, and cost is reduced.
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