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Compact adaptive optical system based on blind optimization and a micromachined membrane deformable mirror.

M L Plett, P R Barbier, D W Rush

|March 22, 2008

Summary

This study presents a compact adaptive optical system using a deformable mirror and a control algorithm to improve laser beam coupling into optical fibers. The system achieved a 12 dB improvement, reaching 64% of diffraction-limited efficiency.

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Area of Science:

Optical Engineering
Photonics
Control Systems

Background:

Laser beam distortion degrades coupling efficiency into single-mode optical fibers.
Traditional adaptive optics systems can be bulky and expensive.

Purpose of the Study:

To demonstrate a compact and cost-effective adaptive optical system.
To maximize laser beam coupling into a single-mode optical fiber despite distortions.

Main Methods:

Utilized a micromachined membrane deformable mirror.
Implemented the stochastic parallel gradient descent (SPGD) control algorithm.
Integrated these components into a functional adaptive optics system.

Main Results:

Achieved a 12 dB improvement in coupling efficiency.
The corrected coupling efficiency reached 64% of the diffraction-limited value.
Demonstrated the system's effectiveness in real-time beam correction.

Conclusions:

The developed adaptive optical system is effective for enhancing laser-to-fiber coupling.
The combination of a membrane deformable mirror and SPGD offers a compact and affordable solution.
This technology has potential applications in optical communications and sensing.