Efficient calibration method of total polarimetric errors in a channeled spectropolarimeter

Area of Science:

• Optical Engineering
• Spectropolarimetry
• Metrology

Background:

• Channeled spectropolarimeters (CSP) are susceptible to total polarimetric errors.
• These errors stem from alignment, retardance, nonideal components, and polarizer imperfections.
• Accurate calibration is crucial for reliable spectropolarimetric data acquisition.

Purpose of the Study:

• To propose and demonstrate an efficient calibration method for total polarimetric errors in CSP.
• To reduce measurement time and complexity compared to existing calibration techniques.
• To ensure high accuracy and reliability of the calibrated CSP systems.

Main Methods:

• Developed a calibration method for total polarimetric errors in channeled spectropolarimeters (CSP).
• Constructed a calibrated modulation matrix by directly measuring the Mueller matrix spectrum of the polarization module.
• Reduced calibration measurements from 1074 to only 16 individual measurements.

Main Results:

• Achieved a 67-fold reduction in measurement time.
• Ensured high accuracy with a maximum root-mean-square (rms) error below 0.02.
• Validated the method's efficiency, reliability, and accuracy across three different CSP systems.

Conclusions:

• The proposed calibration method is highly efficient and accurate for CSP systems.
• This technique significantly simplifies the calibration process while maintaining data integrity.
• The method offers a reliable solution for mitigating polarimetric errors in spectropolarimetry.