Fast beam steering with full polarization control using a galvanometric optical scanner and polarization controller.

Area of Science:

• Optics and Photonics
• Materials Science
• Information Technology

Background:

• Galvanometer-based scanners offer cost-effective optical beam steering but lack polarization control.
• Precise polarization control is crucial for advanced applications in material processing, information technology, and medical imaging.
• Existing systems struggle to decouple beam pointing direction from polarization state.

Purpose of the Study:

• To develop an integrated system for optical beam steering with independent polarization control.
• To enable precise manipulation of optical beam direction without altering its polarization state.
• To address limitations in current beam steering technologies for polarization-sensitive applications.

Main Methods:

• Development of a polarization steerable system combining a fiber polarization controller and a galvanometric scanner.
• Implementation of a digital signal processor board for synchronized control of both components.
• Utilizing a feed-forward control scheme to decouple polarization control from beam pointing direction.

Main Results:

• Demonstrated successful compensation of polarization angle errors exceeding 0.2 radians.
• Achieved polarization compensation within a temporal window of approximately 20 milliseconds.
• The system effectively directs optical beams to desired directions while preserving their initial polarization state.

Conclusions:

• The developed system offers robust and integrated control over both optical beam direction and polarization.
• This technology is highly integrable and suitable for diverse industrial and scientific applications.
• The ability to decouple polarization from pointing direction opens new possibilities in laser-based technologies.