Optical Assembly Retardance Minimization via Polarization Complementarity
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Solution Overview
Problem
Optical system assemblies face challenges in maintaining high transmission and low wavefront errors due to manufacturing variations and material properties, particularly when stacking optical elements, which can introduce additional wavefront errors degrading overall performance.
Innovation Solution
The method involves measuring retardance profiles of optical elements using a polarimeter and positioning them in relative orientations that enhance complementarity between their retardance profiles to minimize combined retardance, thereby optimizing the assembly and reducing wavefront errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical elements are stacked together to form an optical assembly, then the optical system can achieve the required imaging function, but additional wavefront errors are introduced that degrade overall performance
Solution Approach 1:
The patent applies preliminary action by measuring the retardance profiles of optical elements before assembly and using these measurements to determine optimal relative orientations. This pre-characterization allows the assembly process to compensate for manufacturing variations and minimize cumulative wavefront errors, thereby maintaining high optical performance despite the complexity of stacking multiple elements.
2Reliability
If optical materials are chosen for their index of refraction and transmission properties, then basic imaging requirements are met, but retardance effects are not optimized
Solution Approach 1:
The patent applies parameter changes by measuring and characterizing the retardance profiles of optical elements and then adjusting their relative orientations to minimize cumulative retardance effects. This goes beyond traditional material selection based on index of refraction and transmission, adding retardance optimization as an additional controllable parameter that directly reduces polarization-related wavefront errors and improves overall optical performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces sources of error in optical assemblies by controlling and optimizing retardance during the stacking process, leading to improved optical performance by minimizing cumulative errors and enhancing the retardance performance of the assembled system.
Implementation Method 1
measuring retardance profiles of a plurality of optical elements with a polarimeter comprising a light source, at least two optical polarization elements, and a detector capable of detecting polarization changes
Implementation Method 2
measuring retardance profiles - measuring retardance azimuthal profiles
Data Source
AI summary
According to some embodiments a method of assembling an optical system comprises steps of: measuring retardance profiles of a plurality of optical elements, relatively positioning the optical elements in relative orientations that enhance complementarity between the retardance profiles of the optical elements, and securing the combinations of relatively oriented optical elements together, to control or minimize the combined retardance of the stacked optical elements.