# Real-time programmable mode-locked fiber laser with a human-like algorithm

## TL;DR

This paper introduces a real-time programmable mode-locked fiber laser controlled by a novel human-like algorithm, enabling automatic operation across multiple regimes with rapid locking times, enhancing robustness and practical utility.

## Contribution

The paper presents the first experimental demonstration of a fiber laser controlled by a human-like algorithm, allowing automatic mode-locking and regime switching without physical modifications.

## Key findings

- Average initial mode-locking time of 3.1 seconds
- Recovery time from detachment is 58.9 milliseconds
- Successfully switches between multiple laser regimes automatically

## Abstract

Nonlinear polarized evolution-based passively mode-locked fiber lasers with ultrafast and high peak power pulses are a powerful tool for engineering applications and research. However, their sensitivity to polarization limits their widespread application. To address this, automatic mode-locking immune to environmental disturbances is attracting more concerns. An experimental demonstration of the first real-time programmable mode-locked fiber laser is presented, which is enabled by our proposed human-like algorithm. It combines human logic with a machine's speed, computing capability, and precision. The laser automatically locks onto multiple operation regimes such as fundamental mode-locking, harmonic mode-locking, Q-switching, and even Q-switched mode-locking without physically altering its structure. The average initial mode-locking times (with randomly-assigned original polarization states and recover time from detachment under 10 successive experiments) are only 3.1 s and 58.9 ms. We believe this intelligent laser's superior performance can find practical applications in engineering and scientific research.

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Source: https://tomesphere.com/paper/1812.00796