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Multiple wavelength digital holography for freeform shape measurement and lens alignment
Applied Optics
|May 3, 2023
Summary
This study presents a novel digital holography technique for precise freeform optical surface measurements. The method uses multiple wavelengths to accurately assess diffuse surfaces and optical system component placement.
Area of Science:
- Optics and Photonics
- Metrology
Background:
- Accurate measurement of freeform optical surfaces is crucial for advanced optical system design.
- Traditional metrology techniques face challenges with diffuse and complex surface geometries.
Purpose of the Study:
- To introduce and validate a digital holography technique for high-precision freeform optical surface measurement.
- To demonstrate the capability of measuring diffuse surfaces and diagnosing optical element placement.
Main Methods:
- Utilized a Mach-Zehnder holographic profiler.
- Employed digital holography with multiple discrete wavelengths or wavelength scanning.
- Optimized the experimental setup for maximal theoretical precision.
Main Results:
- Successfully measured freeform diffuse optical surfaces.
- Demonstrated high precision in surface profiling.
- Showcased applicability for precise diagnostics of optical system element placement.
Conclusions:
- The developed digital holography technique offers a precise and versatile solution for freeform optical metrology.
- This method advances the capabilities for characterizing complex optical surfaces and systems.
