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Related Experiment Video

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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

Diffractive-optics-based beam combination of a phase-locked fiber laser array.

Eric C Cheung¹, James G Ho, Gregory D Goodno

¹Northrop Grumman Space Technology, One Space Park, R1-1196, Redondo Beach, California 90278, USA.

|February 19, 2008

Summary

A novel diffractive optical element (DOE) enables efficient coherent beam combination for fiber laser arrays. This technique improves beam quality and maintains phase locking despite input fluctuations, showing scalability for high power applications.

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Area of Science:

Optics and Photonics
Laser Physics
Optical Engineering

Background:

Coherent beam combination of fiber lasers is crucial for high-power laser systems.
Traditional methods like tiling often suffer from sidelobe losses and reduced beam quality.
Active phase-locking is essential for maintaining coherence in laser arrays.

Purpose of the Study:

To investigate the use of a diffractive optical element (DOE) as a beam combiner for actively phase-locked fiber laser arrays.
To evaluate the efficiency and beam quality achieved with DOE-based coherent combination.
To assess the robustness of the technique against amplitude and phase fluctuations.

Main Methods:

A diffractive optical element (DOE) was designed and implemented as a beam combiner.
An array of five fiber lasers was actively phase-locked.
The far-field pattern, combination efficiency, and beam quality (M2) were measured.
The system's performance under simulated amplitude and phase fluctuations was analyzed.

Main Results:

The DOE successfully eliminated far-field sidelobes, improving beam quality.
Coherent combination of five fiber lasers was achieved with 91% efficiency.
A near-perfect beam quality with M2=1.04 was demonstrated.
The phase locking and combination efficiency remained robust despite significant input fluctuations.

Conclusions:

Diffractive optical elements offer a superior method for coherent beam combination in fiber laser arrays.
This DOE-based approach significantly enhances efficiency and beam quality compared to traditional tiling.
The demonstrated robustness and scalability suggest potential for high-channel-count and high-power laser systems.