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Optimization of retardance for a complete Stokes polarimeter
Optics Letters
|December 8, 2007
Summary
We optimized a complete Stokes polarimeter for noise immunity using singular value decomposition. Optimal settings improve signal-to-noise ratio by 1.5x compared to quarter-wave plates.
Area of Science:
- Optical Engineering
- Polarimetry
- Signal Processing
Background:
- Complete Stokes polarimeters are crucial for optical measurements.
- Assessing and improving noise immunity is vital for polarimeter performance.
Purpose of the Study:
- To develop figures of merit for assessing polarimeter noise immunity.
- To optimize a specific polarimeter design for enhanced signal-to-noise ratio.
Main Methods:
- Singular value decomposition (SVD) was used to derive figures of merit.
- Optimization involved a rotatable retarder and fixed polarizer.
- Retardance and orientation angles were systematically varied.
Main Results:
- Optimal retardance is approximately 132 degrees (3/8 wave).
- Optimal retarder orientation angles are +/-51.7 and +/-15.1 degrees for four measurements.
- This configuration yields a 1.5x improvement in signal-to-noise ratio over quarter-wave plates.
Conclusions:
- The developed figures of merit effectively assess noise immunity.
- The optimized polarimeter design significantly enhances signal-to-noise ratio.
- Additional measurements beyond the optimal four did not show further advantages.
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