Corner Cube Reflector Polarization Compensation Across Six Raypaths
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Solution Overview
Problem
Corner cube reflectors often change the polarization state of light due to reflections, which is problematic for applications requiring polarization preservation or specific polarization changes, especially at varying angles of entry.
Innovation Solution
A polarization compensator is integrated with the corner cube reflector, comprising six sub-apertures with birefringent material layers, each with a unique fast axis orientation, to ensure consistent polarization output across different raypaths, regardless of the entry angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a corner cube reflector is used to redirect light at a range of angles, then the adaptability and angular coverage are improved, but the polarization state of the light changes due to multiple reflections
Solution Approach 1:
The entrance aperture of the corner cube reflector is divided into six sub-apertures, each corresponding to a specific raypath. A polarization compensator with six corresponding sub-apertures is positioned in front of the reflector, with each sub-aperture containing birefringent material layers configured to compensate for polarization changes specific to its associated raypath. This segmentation allows polarization compensation to be applied independently to each raypath while maintaining the reflector's angular coverage capability.
Solution Approach 2:
Each sub-aperture of the polarization compensator contains birefringent material layers with specific fast axis orientations and thicknesses tailored to the requirements of its associated raypath. The fast axis orientation and layer thickness vary from sub-aperture to sub-aperture, providing localized polarization compensation optimized for each specific light path through the corner cube reflector.
2Reliability
If polarization compensation is added to maintain consistent polarization output, then the polarization preservation is improved, but the device complexity increases due to additional components
Solution Approach 1:
The polarization compensator is integrated with the corner cube reflector by positioning it directly in front of the reflector's entrance aperture. The compensator's six sub-apertures are aligned with the six raypaths of the reflector, merging the polarization compensation function with the existing reflector structure. This integration allows both functions to work together as a unified optical system.
Solution Approach 2:
The birefringent material layers in each sub-aperture act as an intermediary element that modifies the polarization state of light before it enters the corner cube reflector. These intermediate layers compensate for the polarization changes that will occur during the three reflections, ensuring that the output polarization matches the input polarization despite the reflective process.
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
The solution maintains consistent polarization states for incoming light, achieving uniform polarization output across a range of angles and applications, including improved accuracy in optical systems and object counting.
Implementation Method 1
Each sub-aperture comprises one or more layers comprising birefringent material, each sub-aperture has a different fast axis compared to any other sub-aperture, and each sub-aperture is configured to impart a particular amount of polarization compensation to the light that is incident thereon
Implementation Method 2
corner cube reflector configured to receive input light and produce output light in six unique raypaths, where each raypath consists of three reflections of the input light from a corresponding combination of corner cube reflector surfaces
Data Source
AI summary
Methods, systems and devices to compensate polarization aberration associated with a corner cube are described. One example retroflector system includes a corner cube reflector to receive input light and produce output light in six unique raypaths. Each raypath consists of three reflections of the input light before exiting the corner cube reflector. The retroflector system further includes a polarization compensator that includes six sub-apertures positioned to allow light associated with each unique raypath to enter one of the sub-apertures before entering the corner cube reflector and to exit another one of the sub-apertures after exiting the corner cube reflector. Each sub-aperture includes one or more layers of birefringent material and has a different fast axis compared to other sub-aperture. Each sub-aperture imparts a particular amount of polarization compensation such that exitant light has the same output polarization, regardless of which sub-aperture the light exits from.