Cascaded multi-dithering theory for coherent beam combining of multiplexed beam elements

Area of Science:

• Optics and Photonics
• Laser Physics
• Fiber Laser Technology

Background:

• Coherent beam combining is crucial for increasing laser power.
• Scaling fiber laser power requires advanced active phase control techniques.
• Existing methods face limitations in managing large numbers of beam elements.

Purpose of the Study:

• To introduce and validate the Cascaded Multi-Dithering theory.
• To demonstrate the feasibility of this theory for M-by-N beam combining.
• To present a scalable solution for active phase control in high-power fiber lasers.

Main Methods:

• Theoretical framework of Cascaded Multi-Dithering.
• Experimental setup for combining sixteen fiber laser beams.
• Active phase control algorithms based on dithering.

Main Results:

• Successful coherent combination of sixteen individual beams.
• Experimental verification of the Cascaded Multi-Dithering theory.
• Demonstrated feasibility for scalable laser power amplification.

Conclusions:

• Cascaded Multi-Dithering is a viable active phase control method.
• This theory enables efficient coherent beam combining for M-by-N elements.
• The approach is promising for scaling high-power fiber laser systems.