Polarization state fixer composed of passive optical devices

Area of Science:

• Optics and Photonics
• Materials Science

Background:

• Controlling light polarization is crucial for various optical applications.
• Random fluctuations in the polarization state of light sources pose a significant challenge.
• Existing methods for polarization control may lack robustness or efficiency.

Purpose of the Study:

• To investigate a polarization state fixer capable of producing light with a desired polarization state and constant power.
• To analyze the performance of a device designed to handle arbitrary elliptically polarized input light with randomly fluctuating principal axes.
• To determine the feasibility of creating a passive device for fixed-axis, linearly polarized light output.

Main Methods:

• A polarization state fixer was designed and theoretically investigated.
• The proposed device consists of a quarter-wave plate and a polarizer.
• Experimental characterization was performed at wavelengths of 633 nm and 1550 nm.

Main Results:

• The proposed device aims to stabilize arbitrary elliptical polarization to a desired output state.
• Demonstrations were conducted at specific wavelengths (633 nm and 1550 nm) to validate the concept.
• The study highlights limitations in achieving constant power and fixed linear polarization simultaneously.

Conclusions:

• A passive device cannot reliably produce fixed-axis, linearly polarized light with constant power from elliptically polarized light with varying parameters.
• The random fluctuation of the input light's elliptical axis presents a fundamental challenge for passive polarization control.
• Further research may be needed to explore active or more complex systems for robust polarization stabilization.