Narrow linewidth laser external cavity coupling system and method based on linewidth test feedback

By using a narrow-linewidth laser external cavity coupling system based on linewidth test feedback, the automatic adjustment of optical power and linewidth is realized, solving the problems of low production efficiency and poor parameter consistency in the existing technology. It is suitable for high-precision fiber optic sensing and coherent lidar applications.

CN121663314BActive Publication Date: 2026-06-09CHENGDU SUFASTECH TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHENGDU SUFASTECH TECH CO LTD
Filing Date
2025-12-05
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing narrow-linewidth laser external cavity coupling technology suffers from long debugging cycles, large accuracy dispersion, and poor operational reproducibility, making it difficult to meet the production efficiency and parameter consistency requirements of high-precision fiber optic sensing and coherent lidar applications.

Method used

A narrow-linewidth laser external cavity coupling system based on linewidth test feedback is adopted. The laser measurement module measures the optical power and linewidth in real time, and the coupling control module automatically adjusts the external cavity position to ensure maximum optical power and linewidth that meets preset conditions, thus achieving fully automated coupling.

Benefits of technology

It improves production efficiency and process stability, ensures parameter consistency, is suitable for large-scale production, and avoids the subjective influence of manual operation.

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Abstract

The application discloses a narrow-linewidth laser external cavity coupling system and method based on linewidth test feedback, adopts a self-feedback mechanism to perform external cavity coupling, wherein through optical power real-time feedback, the laser can be ensured to be in the best working state when measuring the linewidth, so that the accuracy of the linewidth measurement can be improved, and reliable data can be provided for subsequent external cavity position adjustment; after the linewidth measurement is completed, the external cavity clamp displacement table can be controlled to adjust the position of the external cavity of the narrow-linewidth laser according to the linewidth, until the linewidth of the laser output by the external cavity reaches a preset target, and the best coupling position of the external cavity can be determined; thus, the application comprehensively considers the optical power and the laser linewidth to perform external cavity coupling, can ensure that the actual performance meets the design index, ensures the parameter consistency, and the whole process is fully automated, without the intervention of personnel, effectively avoiding the subjective influence of the operator, so that the process stability and the production efficiency are improved.
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