High-power, cladding-pumped all-fiber laser with selective transverse mode generation property

Area of Science:

• Fiber optics
• Laser physics
• Photonics

Background:

• Generating specific higher-order transverse modes in fiber lasers is crucial for advanced applications.
• Existing methods often face limitations in power scalability and mode selectivity.
• All-fiber laser systems offer advantages in robustness and cost-effectiveness.

Purpose of the Study:

• To demonstrate the first cladding-pumped all-fiber oscillator for selective transverse mode generation.
• To achieve high output power in a single higher-order transverse mode (LP11).
• To investigate the performance and characteristics of the developed fiber laser system.

Main Methods:

• Utilized a mode-selective fiber Bragg grating pair for transverse mode control.
• Implemented a cladding-pumped all-fiber oscillator configuration.
• Analyzed output power, slope efficiency, intensity distribution, and spectral evolution.

Main Results:

• Achieved 4.2 W maximum output power operating in the second-order (LP11) mode.
• Obtained a slope efficiency of approximately 38%.
• Reported the highest output power for single higher-order transverse mode generation in an all-fiber configuration to date.

Conclusions:

• The developed mode-selective fiber Bragg grating pair enables selective higher-order transverse mode generation in all-fiber oscillators.
• The system demonstrates significant potential for realizing higher output power with controlled mode operation.
• This work paves the way for advanced fiber laser sources with tailored mode properties.