Adaptive Optical System for High-Speed Target Wavefront Compensation
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Solution Overview
Problem
Existing adaptive optics technologies face challenges in simultaneously achieving high-speed correction, high resolution, and large correction amounts while maintaining precise tracking of a moving target, especially when the target is moving at high speeds, as they struggle to effectively compensate for wavefront disturbances caused by atmospheric fluctuations.
Innovation Solution
The adaptive optical system employs a configuration with multiple driving mirrors and a controller that uses Zernike polynomials to generate control signals for each mirror, allowing for the adjustment of the first, second, and third driving mirrors to correct inclination, focus, and higher-order aberrations, respectively, ensuring that the laser light wavefront is accurately compensated even for fast-moving targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adaptive optics technology is used to correct wavefront disturbances, then atmospheric fluctuation compensation is achieved, but the system cannot effectively track and compensate for high-speed moving targets
Solution Approach 1:
The patent divides the wavefront correction into multiple independent stages using separate deformable mirrors. The first deformable mirror corrects low-order aberrations (inclination and focus), while the second deformable mirror corrects high-order aberrations. This segmentation allows each mirror to operate independently at optimal speeds, enabling effective tracking of high-speed moving targets while maintaining accurate wavefront compensation.
2Reliability
If multiple deformable mirrors are used to correct both focal position and wavefront distortion, then comprehensive correction is achieved, but device complexity increases
Solution Approach 1:
The patent segments the wavefront correction function into two distinct deformable mirrors with specialized roles. The first deformable mirror handles focal position and low-order aberrations, while the second deformable mirror focuses on high-order wavefront distortions. This functional segmentation provides comprehensive correction coverage while keeping each mirror's control algorithm relatively simple and manageable.
Solution Approach 2:
The patent implements dynamic control where the first deformable mirror operates at a higher update frequency to track fast-moving targets, while the second deformable mirror operates at a lower update frequency for atmospheric turbulence compensation. This dynamic differentiation optimizes the overall system performance by matching each mirror's operational characteristics to its specific function.
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 approach enables effective optical compensation of wavefront disturbances, ensuring that the laser light reaches the target with minimal distortion, even under conditions of rapid atmospheric fluctuations, thereby improving the accuracy and reliability of high-speed laser targeting systems.
Implementation Method 1
observing a wavefront of light propagating through an atmosphere by use of a wavefront sensor
Implementation Method 2
compensating the wavefront by use of a deformable mirror adjusted in accordance with a result of this observation
Implementation Method 3
a wavefront of light is disturbed by an atmosphere fluctuation when the light propagates through the atmosphere
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
Wavefront disturbance of reference light arriving from a target is observed and a wavefront conjugate to this wavefront is generated by a driving optical system. A plurality of control signals is generated according to a plurality of Zernike coefficients calculated as a Zernike polynomial approximating a wavefront disturbance in order to drive a plurality of deformable mirrors included in the driving optical system. Provided is an adaptive optical system capable of optically compensating a wavefront disturbance arising from atmospheric fluctuations even when a target moving at high speed is irradiated with laser light.