Beam Splitting Module With Polarization Compensation
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Solution Overview
Problem
Existing optical systems face challenges in preserving the polarization state of light during reflection and transmission, especially when beam geometry constraints require precise control, such as in multiphoton microscopy and quantum optics, as existing solutions do not allow for beam crossing in existing optical systems while maintaining polarization.
Innovation Solution
A beam splitting/mixing module with a main optical element and a compensating optical element, along with corner mirrors, that allows for a 90° beam crossing in the same plane, preserving the initial polarization state of light beams and being compact enough to fit within existing optical systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dichroic mirror or plate beam splitters are used to split or combine light beams, then beam splitting/mixing function is achieved, but polarization state of light is modified due to reflection and transmission at non-normal incidence
Solution Approach 1:
The beam splitting/mixing function is divided into separate operations: one optical element handles beam splitting/mixing while dedicated compensating optical elements correct polarization distortions. This segmentation allows each component to be optimized for its specific function, resolving the contradiction between achieving beam splitting and maintaining polarization control.
Solution Approach 2:
Compensating optical elements act as intermediaries between the beam splitter and the light beam. These intermediaries introduce opposite polarization distortions that cancel out the distortions caused by the beam splitter, thereby preserving the original polarization state while enabling beam splitting/mixing.
2Manufacturing precision
If existing polarisation-maintaining modules are used to preserve polarization state, then polarization is maintained, but beam crossing geometry required by existing optical systems cannot be achieved
Solution Approach 1:
The invention introduces angular dimension to the light path configuration by using corner mirrors to redirect beams at specific angles (e.g., 90 degrees). This dimensional change in beam geometry allows the module to achieve beam crossing configurations compatible with existing optical systems while maintaining polarization through the compensating element arrangement.
Solution Approach 2:
The optical elements are arranged in an asymmetric configuration where the compensating elements are positioned at specific angles relative to the beam path. This asymmetric arrangement enables the module to produce specific beam crossing geometries (such as perpendicular beams) while the compensating elements maintain polarization control.
3Manufacturing precision
If multiple optical elements are added to compensate polarization distortions, then polarization state is preserved, but device complexity increases
Solution Approach 1:
The beam splitting/mixing function and polarization compensation function are merged into a single integrated module. By combining these functions in one compact assembly with a unified optical path design, the invention reduces overall system complexity compared to using separate beam splitters and polarization compensators as distinct components.
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
Enables beam crossing in existing optical systems while maintaining the initial polarization state of light beams, making it suitable for applications like multiphoton microscopy and quantum optics, and allowing for the combination or splitting of light beams with different spectral ranges.
Implementation Method 1
a main optical element designed to be arranged in an extension of the second rectilinear portion and being able to reflect the first light beam with a distortion of its polarization state
Implementation Method 2
a first compensating optical element identical to the main optical element, designed to be arranged in an extension of the first rectilinear portion and able to reflect the first light beam with a distortion of its polarization state opposite to said distortion of the main optical element
Implementation Method 3
a pair of corner mirrors arranged to guide the first light beam between the main optical element and the first compensating optical element by reflecting the first light beam without distortion of its polarization state
Data Source
AI summary
The present invention concerns a beam splitting/mixing module (30) for an optical system configured to propagate a first light beam (B1) along a first light channel (11);the module (30) comprising:a main optical element (40) able to reflect the first light beam (B1) with a distortion of its polarization state;a first compensating optical element (41) identical to the main optical element (40) and able to reflect the first light beam (B1) with a distortion of its polarization state opposite to said distortion of the main optical element (40);a pair of corner mirrors (51, 52) arranged to guide the first light beam (B1) between the main optical element (40) and the first compensating optical element (41) by reflecting the first light beam (B1) without distortion of its polarization state.