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A 3.7-kW Oscillating-Amplifying Integrated Fiber Laser Featuring a Compact Oval-Shaped Cylinder Package
Donglin Yan1, Ruoyu Liao1, Chao Guo1
1Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900, China.
Micromachines
|February 25, 2023
Summary
A novel oval-shaped fiber laser package significantly reduces size while maintaining high efficiency and power. This compact design suppresses unwanted modes and achieves over 3.7 kW of transverse mode instability-free output.
Area of Science:
- Optics and Photonics
- Laser Engineering
Background:
- Oscillating-amplifying integrated fiber lasers are crucial for high-power industrial applications.
- The size of laser sources is a critical factor in these applications.
- Traditional planar fiber laser packages are often bulky.
Purpose of the Study:
- To propose and demonstrate a compact oscillating-amplifying integrated fiber laser.
- To investigate the impact of an oval-shaped cylinder package on laser performance and integration.
- To achieve high-power, transverse mode instability (TMI)-free output in a minimized footprint.
Main Methods:
- Numerical simulations were performed to analyze the oval-shaped cylinder package's effect on mode suppression.
- An oval-shaped cylinder packaged fiber laser was constructed and tested.
- A custom-made chirped and tilted fiber Bragg grating (CTFBG) was employed for Raman suppression.
Main Results:
- The oval-shaped cylinder package achieved a footprint of 0.024 m², significantly smaller than traditional designs.
- Over 3.7 kW of TMI-free output power was obtained with a slope efficiency exceeding 80%.
- The CTFBG improved Raman suppression to 38 dB at peak power.
Conclusions:
- The oval-shaped cylinder package effectively suppresses high-order modes and facilitates integration.
- This design enables the realization of TMI suppression in high-power fiber lasers.
- The demonstrated fiber laser offers one of the smallest footprints for high-power fiber sources.
