Monolithic Optical Scan Head for Stable High-Speed Imaging
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Solution Overview
Problem
Existing beam scanned optical systems are limited by stability of optical alignment, size, and weight, which restrict their use outside controlled environments, and face challenges in capturing high optical information at increased resolution, leading to limited acquisition speed and potential sample damage.
Innovation Solution
A monolithic optical scan head with a mono-block structure integrating optical components, providing direct mounting and heat dissipation, and a compact design that ensures thermal and mechanical stability, enabling high-speed scanning and robust operation in various environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If traditional separate-component optical systems are used, then optical components can be individually adjusted and aligned, but the system exhibits poor mechanical stability and thermal stability, limiting use outside controlled environments
Solution Approach 1:
Multiple optical components (scanning mirrors, beam splitters, lenses, detectors) are integrated into a single monolithic optical bench structure. This merging eliminates relative motion between components, ensuring stable optical alignment while reducing the number of separate parts that require individual mounting and adjustment.
Solution Approach 2:
The optical bench is constructed from composite materials with low thermal expansion coefficients (e.g., Invar, carbon fiber reinforced polymers, or ceramic composites). These materials maintain dimensional stability across temperature variations, preventing thermal distortion of optical paths and ensuring consistent alignment in environmentally variable conditions.
2Measurement precision
If high resolution spectral and spatial imaging is implemented, then optical information capture is improved, but data load increases limiting acquisition speed and causing potential sample damage
Solution Approach 1:
The system employs continuous wave (CW) laser sources combined with rapid scanning mechanisms to maintain continuous illumination and data acquisition. This eliminates interruptions in the measurement process, allowing high-resolution spectral and spatial data to be collected continuously at high speeds without repeated positioning or exposure delays.
Solution Approach 2:
Rapid periodic scanning of the laser beam across the sample using galvanometer mirrors or acousto-optic deflectors enables high-speed acquisition of spatial information. The periodic modulation of the beam position at frequencies matching the detector sampling rate allows simultaneous collection of high-resolution spectral and spatial data across the entire field of view in parallel.
3Loss of information
If integrated optical design with reflective optics is used, then optical information capture is increased, but alignment precision requirements increase and are difficult to maintain
Solution Approach 1:
All optical components are permanently integrated into the monolithic optical bench structure during manufacturing. Reflective optics (mirrors, beam splitters) are mounted in fixed positions with precision-machined mounting features that eliminate the need for post-assembly alignment. The entire optical path is designed as a rigid integrated unit, ensuring that alignment precision is maintained throughout the device lifecycle without requiring adjustment.
4Area of stationary object
If beam scanning is used to achieve wide field imaging, then spatial coverage is improved, but mechanical stability and positioning reliability are limited
Solution Approach 1:
The system replaces mechanical scanning stages with non-mechanical or minimal-mechanical scanning methods. Acousto-optic deflectors (AODs) or electro-optic deflectors (EODs) use acoustic or electric fields to steer the laser beam, eliminating moving mechanical parts that could introduce instability or positioning errors. Alternatively, if galvanometer mirrors are used, they are mounted on the rigid monolithic optical bench with precision bearings and encoders to maintain positioning reliability across the wide field of view.
Data Source
AI summary
An optical device comprises a plurality of optical components comprising at least one primary mirror and further comprising at least one scanning mirror component and/or at least one spatial light modulator and/or at least one digital mirror, wherein the plurality of optical components are configured to direct light from an input/output module to an objective module and from the objective module to the Input/output module and to manipulate a position and/or pattern of the light; and a mono-block structure In which the plurality of optical components is mounted, wherein the mono-block structure is a continuous single structure having walls and a base.