Compact Polarizing Optical Separator for Stellar Interferometry
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Solution Overview
Problem
Existing polarizing beam splitters for stellar intensity interferometry in atmospheric Cherenkov detectors are not compact, and their polarizing ability is dependent on the angle of incidence, which affects the accuracy of signal evaluation due to differing optical paths and inability to change light polarization combinations.
Innovation Solution
A monolithic and compact polarizing optical separator design with a narrowband optical filter and a beam splitter system where the optical path remains constant, allowing for precise timing of light arrival and adjustable polarization combinations, ensuring identical propagation directions and independence from angle of incidence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional polarizing beam splitters are used, then beam splitting function is achieved, but the device size is large and not compact
Solution Approach 1:
The patent combines multiple optical components (beam splitter, polarizers, wave plates, mirrors) into a single integrated optical separator unit. This merging of components achieves the desired compactness while maintaining all necessary optical functions for stellar intensity interferometry.
Solution Approach 2:
The optical separator is designed to perform multiple functions simultaneously: beam splitting, polarization control, and optical path length equalization. This multi-functionality reduces the need for separate devices, achieving compactness without sacrificing capability.
2Measurement precision
If conventional polarizing beam splitters are used, then beam splitting is achieved, but the polarizing ability depends on angle of incidence
Solution Approach 1:
The patent employs wave plates to actively control and adjust the polarization state of light beams. By changing the orientation and type of wave plates, the system can compensate for angle of incidence variations and maintain accurate polarization-dependent signal evaluation across different operating conditions.
Solution Approach 2:
The patent replaces the mechanical alignment sensitivity of conventional beam splitters with an optical control system using wave plates and polarizers. This substitution allows electronic/optical adjustment of polarization states rather than relying on precise mechanical angular alignment.
3Measurement precision
If different optical paths are used for split beams, then flexibility in optical design is achieved, but timing precision of photon detection deteriorates
Solution Approach 1:
The optical separator is designed with equal optical path lengths for both split beams. This equipotential design ensures that photons from the same source event arrive at detectors simultaneously, maximizing timing precision for photon correlation measurements without requiring complex synchronization electronics.
Solution Approach 2:
The patent introduces selective optical elements (wave plates, polarizers) at specific locations in each optical path to provide local polarization control. This allows differential manipulation of the two beams while maintaining equal overall path lengths, achieving both timing precision and polarization versatility.
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 design enhances signal processing accuracy by ensuring identical optical paths for both split beams, allowing for precise detection of photon correlations with improved precision in tens of picoseconds, enabling more accurate evaluation of stellar intensity interferometry data.
Implementation Method 1
a beam splitter (21) dividing an incident beam into two beams (Sd1, Sd2) with identical directions of propagation and with equal optical path lengths
Implementation Method 2
both beams (Sd1, Sd2) being polarized in polarizers (25, 32)
Implementation Method 3
A monolithic and compact polarizing optical separator design with a narrowband optical filter
Implementation Method 4
followed, in the direction of the output of the first split beam Sd1, by the secondary mirror prism 24
Data Source
Figure 1
AI summary
A polarizing optical separator for stellar intensity interferometry, particularly for use in atmospheric Cherenkov detector, where the separator consists of a fixed optical setup (2) and a rotaiy optical setup (3), where the fixed optical setup (2) is formed by a beam splitter (21) to which a primary mirror prism (22) is attached in the direction of an incidental input beam (Sin) and a deflecting mirror prism (23) is attached in the direction perpendicular to the input beam (Sin), where the primary mirror prism (22) is followed by a secondary mirror prism (24) fitted with the first polarizer (25) on the output surface, and where the rotatable optical setup (3) is formed by a transitive prism (31) provided with the other polarizer (32) on an output surface and is rotatably attached to the deflecting mirror prism (23). The fixed optical setup (2) and the rotatable optical setup (3) are provided with detectors (4) and moreover they are selected so that the optical paths of the split output beams (Sd1) and (Sd2) in both separator arms are essentially identical.