Acousto-Optic Deflector Spectral Compensation
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Solution Overview
Problem
Acousto-optic deflectors (AODs) used in optical beam scanning are sensitive to spectral variations of the scanned beam, leading to variations in deflection angle and scanning accuracy.
Innovation Solution
An optical scanner system that includes a sampler, a dispersive element, detectors, and acousto-optic deflectors (AODs) with a controller that determines the center of mass of the sampled beam and adjusts the drive signal for the AODs to compensate for spectral variations, ensuring accurate deflection angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If acousto-optic deflectors are used for fast optical beam scanning, then scanning speed is improved, but sensitivity to spectral variations causes deflection angle variations and reduced scanning accuracy
Solution Approach 1:
The patent implements a feedback mechanism where detectors monitor the actual spectral content and deflection angle of the optical beam, and the controller adjusts the drive signal frequency to the AOD based on this feedback. This closed-loop system compensates for spectral variations in real-time, maintaining scanning accuracy despite the use of fast AOD scanning.
Solution Approach 2:
The patent dynamically changes the drive signal frequency parameter of the AOD based on detected spectral variations. By adjusting the frequency parameter in response to spectral content changes, the system maintains accurate deflection angles while preserving the fast scanning capability of the AOD.
2Manufacturing precision
If the drive signal frequency is adjusted to compensate for spectral variations, then scanning accuracy is improved, but system complexity increases due to additional detectors and control mechanisms
Solution Approach 1:
The patent designs the detector to serve multiple functions: it detects both the spectral content of the optical beam and the deflection angle position. This multi-functional approach reduces the need for separate detection systems, thereby limiting the increase in system complexity while achieving improved scanning accuracy through spectral compensation.
3Measurement precision
If spectral dispersion is performed on the sampled beam, then spectral variations can be detected, but the optical path complexity increases
Solution Approach 1:
The patent extracts only a sampled portion of the optical beam for spectral analysis rather than dispersing the entire beam. This extraction approach allows spectral detection to be performed on a subset of the beam, reducing the optical path complexity while maintaining sufficient measurement precision for detecting spectral variations that affect scanning accuracy.
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 effectively compensates for spectral variations, maintaining accurate and consistent optical scanning despite changes in the optical beam's spectral characteristics, thereby enhancing scanning precision and speed.
Implementation Method 1
a dispersive element to spectrally disperse the sampled beam along a dispersion direction
Implementation Method 2
one or more acousto-optic deflectors (AODs) to deflect the optical beam from the sampler
Data Source
AI summary
An optical scanner may include a sampler to receive an optical beam and provide a sampled beam including a portion of the optical beam, a dispersive element to spectrally disperse the sampled beam along a dispersion direction, one or more detectors to receive at least a portion of the sampled beam dispersed along the dispersion direction, one or more acousto-optic deflectors (AODs) configured to deflect the optical beam from the sampler, and a controller. The controller may determine a center of mass of the sampled beam dispersed along the dispersion direction based on signals from at least one of the one or more detectors, and generate a drive signal for at least one of the one or more AODs to deflect the optical beam from the sampler along a selected deflection angle based on the center of mass.