Systematic errors in a swept-wavelength null polarimeter for weak linear retardance measurements.

Area of Science:

• Optical Engineering
• Metrology
• Polarimetry

Background:

• High-speed polarimeters are crucial for precise optical measurements.
• Existing null polarimeters offer high sensitivity but face challenges with systematic errors.
• Mueller polarimeters are less sensitive but more robust against systematic errors.

Purpose of the Study:

• To enhance the accuracy of a recently developed high-speed null polarimeter.
• To address systematic errors affecting linear retardance and azimuth measurements.
• To provide practical hardware and numerical solutions for improved polarimetric measurements.

Main Methods:

• Development of a high-speed null polarimeter utilizing passive polarization optics and a wavelength-swept laser.
• Implementation of hardware modifications and numerical algorithms to mitigate systematic errors.
• Experimental validation and theoretical simulations to assess measurement accuracy.

Main Results:

• Achieved linear retardance resolution of 3.1 µdeg/Hz within a 10 µs acquisition time.
• Demonstrated significant improvements in both linear retardance and azimuth measurement accuracy.
• Validated the effectiveness of proposed solutions through rigorous testing.

Conclusions:

• The developed high-speed null polarimeter provides exceptional sensitivity and accuracy for optical measurements.
• Hardware and numerical strategies effectively address systematic errors, enhancing measurement reliability.
• This work advances the capabilities of polarimetric instrumentation for scientific and industrial applications.