Matched filtering for efficient cleanup of strongly distorted beams

Area of Science:

• Optics and Photonics
• Laser Physics

Background:

• Laser beam quality is crucial for many applications.
• Amplitude and phase distortions degrade laser beam quality.
• Existing methods for beam cleanup can be inefficient or complex.

Purpose of the Study:

• To demonstrate an efficient method for one-way cleanup of laser beams.
• To compensate for severe amplitude and phase distortions in laser beams.
• To investigate the efficiency and applicability of holographic matched filtering for beam correction.

Main Methods:

• Utilizing holographic matched filtering to process laser beams.
• Introducing distortions via multimode fibers and ground-glass diffusers.
• Measuring beam quality before and after holographic filtering.

Main Results:

• Achieved efficient one-way cleanup of laser beams.
• Successfully compensated for severe amplitude and phase distortions.
• Demonstrated theoretical efficiencies around 50% for single-polarization light.
• Experimentally confirmed significant improvement in laser beam quality.

Conclusions:

• Holographic matched filtering is an effective technique for laser beam cleanup.
• The method offers a practical solution for correcting distortions from various sources.
• The experimental results validate the theoretical predictions for efficiency and performance.