Polarization-insensitive wide-angle resonant acousto-optic phase modulator

Area of Science:

• Optics and Photonics
• Acousto-Optics

Background:

• Free-space phase modulators commonly use Pockels effect crystals.
• Pockels effect modulators require precise alignment of light polarization and incidence angle.
• This alignment requirement limits their practical application and ease of use.

Purpose of the Study:

• To demonstrate a novel free-space resonant phase modulator.
• To achieve broad acceptance angles for light.
• To minimize dependence on the input light's polarization state.

Main Methods:

• Employed an acousto-optic approach for phase modulation.
• Designed resonant structures for enhanced performance.
• Investigated modulator performance with varying light conditions.

Main Results:

• Successfully constructed free-space resonant phase modulators.
• Demonstrated broad acceptance angles for incident light.
• Showcased minimal dependence on light polarization.
• Achieved megahertz frequency operation with modest power.
• Modulators feature large apertures (>1 cm²) and sub-millimeter thickness.

Conclusions:

• Acousto-optic phase modulators offer a viable alternative to Pockels effect devices.
• The developed modulators provide enhanced usability due to relaxed alignment constraints.
• These modulators are suitable for applications requiring robust and versatile phase control in free-space optics.