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Piston and tilt cophasing of segmented laser array using Shack-Hartmann sensor.

Xiaohua Wang¹, Qiang Fu, Feng Shen

¹The Laboratory on Adaptive Optics, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu, China. wxhua009@163.com

|March 16, 2012

Summary

This study introduces a novel method for correcting laser array errors using a Shack-Hartmann sensor and deformable mirror. The technique effectively corrects piston and tilt errors, enabling arbitrary phasing for laser arrays.

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Area of Science:

Optics and Photonics
Laser Technology
Adaptive Optics

Background:

Laser arrays require precise phase control for coherent beam combination (CBC).
Piston and tilt errors degrade beam quality and combining efficiency.
Existing methods may be complex or limited in dynamic conditions.

Purpose of the Study:

To present a concept for simultaneous detection and correction of piston and tilt errors in laser arrays.
To demonstrate the feasibility of this concept using a Shack-Hartmann sensor and a segmented deformable mirror (DM).
To validate the technique through both simulation and experimental studies.

Main Methods:

Utilizing a Shack-Hartmann sensor for simultaneous measurement of piston and tilt errors.
Employing a segmented deformable mirror (DM) for real-time error correction.

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Implementing the concept within a two-dimensional laser array for coherent beam combination (CBC).

Main Results:

Simulations showed random initial phase errors were corrected within two iterations under steady conditions.
Experimental results confirmed the method's effectiveness in dynamic operational conditions.
The Shack-Hartmann sensor successfully extracted piston errors within the range of -π to π.

Conclusions:

The proposed method provides an effective approach for simultaneous piston and tilt error correction in laser arrays.
This technique enables arbitrary phasing, enhancing the capabilities of coherent beam combination.
The study validates a practical and efficient solution for advanced laser array systems.