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

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Coherent laser addition using binary phase gratings.

J R Leger, G J Swanson, W B Veldkamp

|June 5, 2010

Summary

This summary is machine-generated.

Binary phase diffraction gratings enable coherent coupling of laser arrays into a single beam. This method achieves high coupling efficiency, producing a Gaussian beam with single-laser divergence.

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Area of Science:

Optics and Photonics
Laser Technology
Diffractive Optics

Background:

Laser arrays offer increased power but face challenges in beam combination.
Coherent beam combination is crucial for maintaining beam quality and reducing divergence.

Purpose of the Study:

To demonstrate the use of binary phase diffraction gratings for coherent coupling of laser arrays.
To achieve efficient combination of multiple laser beams into a single, high-quality output beam.

Main Methods:

A binary phase diffraction grating was designed and placed within the cavity of a linear laser array.
The grating superimposed beams from six GaAlAs lasers, directing them into a common output.
Antireflection coatings were applied to the laser array.

Main Results:

A coupling efficiency of 68.4% was achieved for combining six GaAlAs lasers.
The far-field pattern of the combined beams formed a single, on-axis Gaussian beam.
The combined beam exhibited divergence comparable to that of a single laser.

Conclusions:

Binary phase diffraction gratings are effective for coherent beam combination of laser arrays.
This technique enables the generation of a single, high-quality output beam from multiple sources.
The method preserves beam quality and offers a scalable solution for high-power laser systems.