Operating system

Mode volume

Core (optical fiber)

Computer science

Mode (computer interface)

Optics

Fiber optic sensor

Quantum mechanics

Equilibrium mode distribution

Radiation mode

Composite material

Power (physics)

Fiber laser

Optoelectronics

Broadband

Fiber

Single-mode optical fiber

Cladding (metalworking)

Dispersion-shifted fiber

Coupling (piping)

Materials science

Physics

Laser

High Power Laser Science and Engineering

High-power fiber lasers have experienced a dramatic development over the last decade. Further increasing the output power needs an upscaling of the fiber mode area, while maintaining a single-mode output. Here, we propose an all-solid anti-resonant fiber (ARF) structure, which ensures single-mode operation in broadband by resonantly coupling higher-order modes into the cladding. A series of fibers with core sizes ranging from 40 to 100 μm are proposed exhibiting maximum mode area exceeding 5000 μm 2 . Numerical simulations show this resonant coupling scheme provides a higher-order mode (mainly TE 01 , TM 01 , and HE 21 ) suppression ratio of more than 20 dB, while keeping the fundamental mode loss lower than 1 dB/m. The proposed structure also exhibits high tolerance for core index depression.

Design of large mode area all-solid anti-resonant fiber for high-power lasers