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Lens centering error measurement based on subwavelength grating with power analysis.
Applied Optics
|September 14, 2023
Summary
This study introduces a precise lens centering error measurement technique using subwavelength gratings and power analysis. The novel method enhances resolution by four times compared to traditional systems.
Area of Science:
- Optics
- Metrology
- Nanotechnology
Background:
- Accurate lens centering is critical for optical system performance.
- Existing centering error measurement systems have limitations in resolution and sensitivity.
Purpose of the Study:
- To develop a highly accurate and sensitive technique for measuring lens centering error.
- To improve upon existing optical centering error measurement systems.
Main Methods:
- A module utilizing a subwavelength grating patterned prism and a reflection-centering system.
- Analysis of -1st-order diffracted rays at 5 mW and 650 nm.
- Optical axis error measurement using a powermeter, Snell's law, and diffractive characteristics.
Main Results:
- Achieved a resolution of optical-centering error amplified by a factor of 4 compared to autocollimation-based systems.
- Demonstrated high accuracy in measuring lens centering error.
- The technique leverages power analysis for precise measurements.
Conclusions:
- The proposed technique offers improved instrument sensitivity for lens centering error measurement.
- Reduced sensor requirements due to reliance on light direction and energy variation.
- Provides a more effective method for optical component alignment.
