All-fiber polarization-dependent optical vortex beams generation via flexural acoustic wave

Area of Science:

• Photonics
• Acousto-optics
• Fiber optics

Background:

• Optical mode conversion is crucial for manipulating light.
• Acousto-optic effects in fibers offer unique control mechanisms.

Purpose of the Study:

• To theoretically demonstrate a novel all-fiber acousto-optic mode conversion.
• To achieve narrowband transformation of the fundamental mode into optical vortex beams.

Main Methods:

• Utilizing a lowest-order flexural acoustic wave.
• Theoretical demonstration of the acousto-optic interaction in a fiber.

Main Results:

• Complete transformation of the fundamental mode into a frequency-downshifted optical vortex beam.
• Topological charges of +1 or -1 are achievable.
• Polarization dependence of the conversion process, controlled by input light polarization.

Conclusions:

• The demonstrated acousto-optic method provides a novel way to generate and control optical vortex beams.
• The polarization-dependent nature allows for precise manipulation of topological charge and polarization state.
• Potential applications in optical vortex manipulation and related fields.