81-beam coherent combination using a programmable array generator

Area of Science:

• Optics and Photonics
• Optical Engineering

Background:

• High channel-count beam combination is crucial for advanced optical systems.
• Characterizing diffractive combiners and detecting phase errors are key challenges.

Purpose of the Study:

• To characterize a diffractive combiner for 81 independently controllable beams.
• To develop a fast phase error detection scheme for efficient beam combination.
• To establish a platform for advanced feedback phase control.

Main Methods:

• Generated 81 independently controllable beams using a spatial light modulator.
• Combined beams on a diffractive combiner.
• Developed and applied a novel method for measuring a key diffractive combiner parameter.
• Implemented a fast phase error detection scheme.

Main Results:

• Successfully characterized the diffractive combiner.
• Demonstrated a new method for measuring a key combiner parameter.
• Enabled efficient beam combination through calibrated phase programming.
• Established a testbed for advanced phase control.

Conclusions:

• The developed fast phase error detection scheme is effective for high channel-count beam combination.
• The novel measurement technique enhances diffractive combiner efficiency.
• The testbed facilitates future advancements in optical beam control.