Multi-output low-frequency picosecond mode-locked fiber laser based on cascaded contra-directional coupler

The linear resonant cavity fiber laser designed by cascaded differential beam splitters solves the problems of large size and poor synchronization of traditional low repetition rate fiber lasers, and realizes compact low repetition rate multi-channel output with high synchronization accuracy, good stability and adaptability to wide pump power fluctuations.

CN122118503APending Publication Date: 2026-05-29SUZHOU INNGU LASER
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SUZHOU INNGU LASER
Filing Date
2026-04-27
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Traditional low-repetition-rate fiber lasers are large in size, have complex multi-output systems and poor synchronization. The multi-stage beam splitting in the cavity leads to high losses and makes it difficult to achieve stable mode locking, thus failing to meet the practical application requirements under a wide pump range.

Method used

A cascaded differential beam splitter design is adopted. By using a linear resonant cavity composed of fiber gratings, gain fibers, cascaded beam splitting networks and saturable absorbers, the length and loss of the linear cavity fiber laser are controlled to achieve low repetition frequency multi-path output. The 9:1 splitting ratio of 2×2 fiber beam splitters and the reasonable number of cascaded beam splitters ensure synchronization and stability.

Benefits of technology

It achieves multi-channel output with low repetition frequency in a compact size, with high synchronization accuracy, low inter-channel time jitter, low mode-locking threshold, good stability, adaptability to wide pump power fluctuations, and meets the parallel processing requirements of multiple fixed-delay pulse sequences.

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Abstract

The application discloses a multi-output low-frequency picosecond mode-locked fiber laser based on a cascade contrast differential beam splitter, which comprises a fiber grating, a gain fiber, a cascade light splitting network, a saturable absorber and a pump coupler for injecting pump light into the gain fiber; the fiber grating, the gain fiber, the cascade light splitting network and the saturable absorber are sequentially connected and constitute a linear resonant cavity with a target set length, and the fiber grating in the linear resonant cavity is connected with the pump coupler to build a linear cavity fiber laser; the length of the entire linear cavity fiber laser can be controlled by controlling the target set length of the linear resonant cavity composed of the fiber grating, the gain fiber, the cascade light splitting network and the saturable absorber, so that the volume of the linear cavity fiber laser is smaller, and meanwhile, after the target set length of the linear resonant cavity is controlled, low repetition frequency can be realized directly in a fundamental mode without complex harmonic mode-locking control.
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