Auto-collimating Guide Star Generation for Adaptive Optics
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing optical systems using multiple guide stars for detecting optical aberrations are sensitive to misalignment of optical elements, leading to errors in aberration detection and correction, particularly in environments with mechanical movement or thermal expansion.
Innovation Solution
An optical system with an auto-collimating setup where the optical element focuses collimated light to a plurality of focal points and reflects guide star light beams back as collimated beams, reducing alignment sensitivity and allowing for flexible guide star configuration using a collimating lens array and field stop to minimize stray light and simplify analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple guide stars are used to measure aberrations over a larger field of view, then the measurement capability is improved, but the system becomes more sensitive to misalignment of optical elements
Solution Approach 1:
The reference light source is segmented into multiple point sources arranged in an array, with each point source generating a separate guide star. This segmentation allows independent optimization of each guide star's position and characteristics while maintaining overall system stability through the shared optical path.
Solution Approach 2:
The optical elements (lenses, apertures, mirrors) are designed to serve multiple functions simultaneously: they guide light from all point sources in the array, maintain collimation for multiple beams, and provide a common path for all guide stars. This multi-functionality reduces the number of separate alignment requirements.
2Adaptability or versatility
If collimated light beams are used from multiple point sources, then the guide star configuration is improved, but precise positioning of optical elements becomes critical
Solution Approach 1:
The system creates an equipotential optical environment where all point sources in the array are positioned at the same distance from the common lens, ensuring that all guide stars experience identical optical conditions. This eliminates differential alignment errors that would arise from position variations.
Solution Approach 2:
A common lens serves as an intermediary element that receives light from multiple point sources and transforms it into parallel beams. This single intermediary component simplifies the optical path and reduces the number of precision positioning requirements compared to using separate optical elements for each guide star.
3Adaptability or versatility
If mechanical movement or thermal expansion occurs in the optical system, then the system adaptability is improved, but alignment errors increase
Solution Approach 1:
The return paths of all guide star beams are merged into a single common optical path that leads to the detector. This merging ensures that all beams experience the same environmental disturbances (thermal expansion, mechanical movement) simultaneously, causing common-mode errors that can be corrected through differential measurement techniques.
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 system is more robust against misalignment, reducing errors in aberration detection and enabling flexible guide star configurations, thus improving the accuracy and adaptability of optical aberration correction in adaptive optics systems.
Implementation Method 1
an optical element configured to focus a collimated light beam incident on the optical element to a plurality of focal points in a conjugate object plane
Implementation Method 2
the optical element is further arranged to transmit a plurality of reflected guide star light beams resulting from reflection of the reference light beams at the object
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
An optical system (120) for detecting optical aberrations of light from an object (101), the optical system comprising: a reference light-source (102) providing collimated reference light; an optical element (212) configured to focus at least one collimated light beam incident on the optical element (212) to a plurality of focal points in a conjugate object plane (214), the optical element (212) being arranged in an optical path between the reference light-source (102) and the object (101) for transmitting a plurality of reference light beams towards the object (101); and a wavefront sensor (112) configured to detect a property indicative of an optical aberration of light incident on the wavefront sensor; wherein the optical element (212) is further arranged to transmit a plurality of reflected guide star light beams resulting from reflection of the reference light beams at the object (101) towards the wavefront sensor (112).