In-phase supermode selection in ring-type and concentric-type multicore fibers using large-mode-area single-mode...

Area of Science:

• Optics and Photonics
• Fiber Laser Technology

Background:

• Multicore fibers (MCFs) are crucial for high-power laser systems.
• Effective supermode selection is essential for maintaining beam quality in MCFs.
• Conventional free-space Talbot cavities have limitations in MCF applications.

Purpose of the Study:

• To propose and investigate a novel all-fiber-optic supermode selection scheme for MCFs.
• To compare the supermode selection characteristics of different MCF types.
• To demonstrate the efficacy of the proposed scheme for high-power laser applications.

Main Methods:

• Development of an all-fiber-optic supermode selection scheme using large-mode-area single-mode fiber.
• Investigation and comparison of coupling coefficients for various ring-type and concentric-type MCFs.
• Performance evaluation against conventional free-space Talbot cavities.

Main Results:

• The in-phase supermode exhibits a significantly higher coupling coefficient than other supermodes.
• The proposed scheme demonstrates superior supermode selection compared to free-space Talbot cavities.
• Effective in-phase supermode selection was achieved for both ring-type and concentric-type MCFs.

Conclusions:

• The all-fiber-optic supermode selection scheme is effective and promising for MCFs.
• This method enables high power output and good beam quality in all-fiber MCF lasers.
• The technique offers a viable alternative to conventional supermode selection methods.