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Efficient conversion of light from sparse laser arrays into single-lobed far field using phase structures.

M Khajavikhan¹, A Hoyer-Leitzel, J R Leger

¹Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, Minnesota 55455, USA. mercedeh@umn.edu

|October 17, 2008

Summary

This study introduces an efficient aperture-filling beam-combining technique for laser arrays. The method directs nearly all laser energy into the main lobe, outperforming Dammann gratings for specific applications.

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Area of Science:

Optics and Photonics
Laser Physics

Background:

Laser arrays offer increased power but face challenges in combining beams efficiently.
Directing combined laser energy to a specific far-field lobe is crucial for applications.

Purpose of the Study:

To introduce and evaluate an aperture-filling beam-combining technique for mutually coherent laser arrays.
To compare this technique with the Dammann grating method for beam superposition.

Main Methods:

Development of an efficient beam-combining technique utilizing aperture filling.
Comparative analysis of the proposed method against the Dammann grating technique.

Main Results:

The aperture-filling method effectively directs almost all energy from a coherent laser array to the far-field main lobe.
A clear connection between the aperture-filling and Dammann grating methods was identified.

Conclusions:

The aperture-filling technique provides an efficient alternative for laser beam combining.
The identified connection suggests distinct optimal applications for both beam-combining methods.