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Efficient fiber coupling system for simultaneous beam shaping and wavelength combining based on misaligned stepped
Applied Optics
|June 10, 2024
Summary
This study introduces an efficient beam shaping method using misaligned stepped prisms to improve semiconductor laser beam quality and power. The technique successfully couples four laser stacks into a single fiber, achieving high output power and efficiency.
Area of Science:
- Optics and Photonics
- Semiconductor Lasers
- Beam Shaping Technology
Background:
- Semiconductor lasers exhibit directional differences in beam quality, hindering efficient fiber coupling.
- Existing methods face challenges in improving beam quality while increasing output power.
Purpose of the Study:
- To develop an efficient beam shaping method for semiconductor lasers.
- To improve beam quality and increase output power through fiber coupling.
- To demonstrate a system without complex prism arrangements.
Main Methods:
- Utilized step multiplexing of misaligned stepped prisms for beam shaping.
- Employed multiple laser stacks to enhance beam quality by eliminating dark areas.
- Integrated laser wavelength combining using reflective surface multiplexing.
- Designed a system avoiding cut-transform-rearranging prisms.
Main Results:
- Successfully coupled four groups of laser stacks into a 400 µm core fiber with a 0.22 numerical aperture.
- Achieved a simulated fiber output power of 2255.4 W.
- Attained a system light-to-light translation efficiency of 88.1%.
Conclusions:
- The proposed misaligned stepped prism method efficiently shapes semiconductor laser beams.
- This technique enhances beam quality, combines wavelengths, and increases output power simultaneously.
- The system offers a practical solution for high-power fiber coupling of semiconductor lasers.
