Integrated Mirror Wavefront Sensor for Adaptive Optics
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Solution Overview
Problem
Existing optical wavefront sensors in adaptive laser optics systems are complex and slow due to the need for separate sensors and wavefront correctors, which increases data processing complexity and reduces response speed, especially when dealing with high-order aberrations and high laser power levels.
Innovation Solution
Integration of a Hartmann or Shack-Hartmann wavefront sensor directly into a mirror structure, allowing light to pass through the reflective surface, which simplifies the system by eliminating the need for separate sensors and wavefront correctors, and is suitable for applications where light attenuation is necessary to prevent damage to optical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate wavefront sensor and wavefront corrector are used in adaptive optics systems, then wavefront measurement and correction can be performed, but the system complexity increases and response speed decreases
Solution Approach 1:
The patent combines the wavefront sensor and wavefront corrector into a single integrated mirror structure. The sensor is positioned at the back of the mirror substrate, allowing incident light to pass through the mirror to the sensor while the front surface provides the reflective function. This merging eliminates the need for separate sensors and correctors, reducing system complexity while maintaining wavefront measurement and correction capabilities.
2Measurement precision
If the number of microlenses in the Shack-Hartmann sensor array is increased to capture higher order aberrations, then measurement precision improves, but data processing complexity and time increase
Solution Approach 1:
The patent replaces the traditional microlens array with a Hartmann mask consisting of a square array of apertures. This substitution simplifies the optical path and reduces the complexity of data processing while maintaining the ability to measure wavefront slopes. The Hartmann mask requires fewer computational steps to process the spot positions compared to the complex focal point calculations required by microlens arrays.
3Device complexity
If a Hartmann mask is used instead of a microlens array, then data processing is simplified, but more incident light is obstructed
Solution Approach 1:
The patent integrates the Hartmann mask apertures directly into the mirror substrate structure. The mask apertures are formed as through-holes or recesses in the mirror substrate itself, allowing light to pass through to the sensor at the back. This integration minimizes additional light obstruction because the mask structure shares the same physical space as the mirror, eliminating the need for separate mask components that would block additional light paths.
4Power
If the reflective surface is made highly reflective to maintain laser power, then laser efficiency improves, but light exposure to sensitive sensor components increases
Solution Approach 1:
The patent positions the sensor in the third dimension at the back of the mirror substrate, behind the reflective surface. Light passes through the mirror substrate to reach the sensor, allowing the front surface to maintain high reflectivity for laser efficiency while the sensor is protected from direct exposure to high power laser light. The mirror substrate acts as a physical barrier that attenuates the light before it reaches the sensitive sensor 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
This integration simplifies adaptive optics systems, reduces complexity, and enhances response speed by allowing for real-time wavefront correction within the laser cavity, while ensuring safety from high laser power levels by minimizing light exposure to sensitive components.
Implementation Method 1
a mirror having a reflective surface arranged to allow a portion of incident light to pass therethrough
Data Source
Figure 1
Figure 2~3
Figure 4a~4b
AI summary
A mirror structure is provided in which at least a portion of a wavefront sensor is integrated with a mirror. In particular, a mirror structure is provided in which a Hartmann mask or a microlens array of a Shack-Hartmann wavefront sensor is integrated with a mirror to provide a very compact wavefront detector/corrector in a single device. Such a mirror structure may be used in a laser cavity to simplify adaptive optics in the cavity. Furthermore, a Hartmann Mask may be integrated with self deforming mirror comprising an active PZT layer bonded to a passive mirror substrate, wherein the Hartmann Mask comprises an array of apertures formed through the active PZT layer.