Adaptive Optics Scanning System Using Reflective Beam Steering
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Solution Overview
Problem
Adaptive optics systems face challenges with large size, dispersion, chromatic aberration, and off-axis aberration due to the use of traditional lens-based and concave mirror-based pupil relay configurations, which complicate beam centration and degrade imaging performance.
Innovation Solution
The system replaces static optical elements with active optical elements to achieve proper beam centration and eliminates the need for 4f relays, using only flat or nearly flat reflective surfaces to minimize dispersion and chromatic aberration, while enabling programmable flexibility for different sample delivery optics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional lens-based and concave mirror-based pupil relay configurations are used, then beam scanning functionality is achieved, but system size increases and chromatic aberration and dispersion occur
Solution Approach 1:
The patent removes the 4f relay lens system from the optical path, extracting only the essential beam scanning and wavefront correction functions. This eliminates the need for complex lens-based pupil relay configurations while maintaining beam scanning capability through direct galvanometer mirror-to-deformable mirror positioning.
Solution Approach 2:
The patent employs concave mirrors with specific radii of curvature (e.g., 50mm, 100mm) to achieve beam scanning and focusing functions previously requiring lens systems. The curved reflective surfaces provide the necessary optical power without introducing chromatic aberration, reducing system size while maintaining scanning functionality.
2Ease of operation
If traditional lens-based pupil relay configurations are used, then beam scanning is achieved, but dispersion and chromatic aberration degrade imaging performance
Solution Approach 1:
The patent replaces lens-based optical systems with mirror-based reflective systems. This substitution eliminates material dispersion and chromatic aberration inherent in lens systems, as mirrors reflect all wavelengths equally. The concave mirrors provide the necessary beam steering and focusing without the optical imperfections associated with refractive elements.
Solution Approach 2:
The patent changes the optical path from transmission through lenses to reflection from mirrors. This parameter change in the fundamental optical interaction mechanism eliminates wavelength-dependent effects, achieving achromatic beam scanning and improving imaging performance across multiple wavelengths without requiring complex chromatic correction.
3Manufacturing precision
If 4f relays are used for pupil relay, then proper beam centration is achieved, but device complexity increases
Solution Approach 1:
The patent merges the beam scanning function and the wavefront correction function into a single integrated optical path without intermediate 4f relay stages. The galvanometer mirrors and deformable mirror are positioned to work directly in sequence, eliminating the need for separate pupil relay systems while maintaining proper beam centration through careful optical design.
Solution Approach 2:
The patent repositions the deformable mirror to be optically conjugate to the galvanometer mirror pupils through direct spatial arrangement rather than through 4f relay optics. This dimensional repositioning in the optical path achieves proper beam centration and pupil conjugation without requiring the complex multi-element relay systems traditionally used for this purpose.
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 results in a compact, high-performance adaptive optics system with improved imaging capabilities across various modalities, including medical, industrial, and material processing applications, by reducing aberrations and enhancing instrument flexibility.
Implementation Method 1
a deformable mirror with 140 actuators to correct for aberrations
Implementation Method 2
a compact beam projection module with four galvanometer-driven mirrors for steering and scanning the beam
Implementation Method 3
using only flat or nearly flat reflective surfaces to minimize dispersion and chromatic aberration
Data Source
AI summary
An adaptive optics scanning system using a beam projection module with four or more axes of motion that can project and control the position and angle of a beam of light to or from an adaptive optics element. The adaptive optics scanning system is compact in size, overcoming the challenges of a traditional lens and mirror based pupil relay design. The adaptive optics scanning system has little to no dispersion, chromatic aberration, and off-axis aberration for improved optical performance. The system and methods for calibrating and optimizing the system are described. A modular adaptive optics unit that scans and interfaces an adaptive optics element is described.