Fast and high-resolution polarization error test of large aperture optics using polarization-tunable interferometric...

Area of Science:

• Optical engineering
• Metrology
• Materials science

Background:

• Large-aperture optical systems demand high precision and broad frequency bands.
• Residual birefringence metrology is critical for manufacturing advanced optical materials.
• Traditional methods are costly, slow, and limit resolution and aperture size.

Purpose of the Study:

• To develop an efficient, high-resolution method for testing polarization errors in large-aperture optical materials.
• To overcome the limitations of existing, expensive, and slow metrology instruments.
• To enable faster and more accurate manufacturing of components for ultra-high precision optical systems.

Main Methods:

• Modeling a polarization-tunable test optical path using Jones matrix.
• Performing detailed mathematical analysis based on the Jones matrix model.
• Validating the method with experiments on a 230 mm flat optical element using a Fizeau interferometer.

Main Results:

• The proposed method achieves high-resolution polarization error testing quickly and efficiently.
• Experimental results show consistency with commercial instruments.
• Repeatability of 0.1 nm/cm (PV) with a standard deviation of 0.029 nm/cm was achieved.
• A Φ200 mm synthetic quartz demonstrated a residual birefringence phase delay better than 0.32 nm/cm.

Conclusions:

• The developed method offers a substantial advancement in polarization error testing.
• It facilitates the achievement of ultra-high precision in optical systems.
• The technique is suitable for large-aperture optical material manufacturing and quality control.