Generation of arbitrary vector beams with cascaded liquid crystal spatial light modulators

Area of Science:

• Optics and Photonics
• Laser Physics
• Material Science

Background:

• Vector beams offer unique polarization properties crucial for advanced optical applications.
• Generating vector beams with tailored polarization and complex amplitude remains a challenge.
• Liquid Crystal Spatial Light Modulators (LCSLMs) are versatile tools for optical wavefront manipulation.

Purpose of the Study:

• To present a flexible and effective method for generating vector beams with arbitrary polarization and complex amplitude.
• To demonstrate the capability of cascaded LCSLMs for precise control over beam characteristics.
• To experimentally validate the generation of specific vector beam types, including radially polarized and Bessel beams.

Main Methods:

• Utilizing two cascaded transmissive liquid crystal spatial light modulators (LCSLMs).
• Implementing a double-pass computer-generated hologram combined with a black-and-white pattern.
• Controlling the complex amplitudes of two orthogonal polarization components of the light beam.

Main Results:

• Successfully generated vector beams with arbitrary polarization and complex amplitude.
• Demonstrated precise control over both polarization state and amplitude distribution.
• Experimentally produced radially polarized vector beams with helical phase and vector Bessel beams with inhomogeneous amplitude.

Conclusions:

• The cascaded LCSLM system provides a flexible and powerful platform for vector beam generation.
• The demonstrated method allows for the creation of complex optical fields with tailored properties.
• This approach has significant potential for applications in optical trapping, microscopy, and information processing.