Optical Cavity Assembly With Removable Mirrors and Stable Alignment
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Solution Overview
Problem
Current methods for manufacturing optical cells that hold mirrors in precise alignment are costly and complicated, especially for longer cells, and do not allow for easy mirror cleaning or replacement without affecting alignment.
Innovation Solution
A cell design with optically aligned and permanently attached end-caps to a tube, using mirror clamps for removable mirrors, allowing for easy cleaning and replacement while maintaining optical alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mirrors are permanently affixed to the cell using adhesive, then the mechanical stability and alignment are improved, but the ease of mirror cleaning and replacement deteriorates
Solution Approach 1:
The cell is divided into separate components: a tube structure and removable end-caps. The end-caps can be detached to access and clean mirrors, while the tube maintains the optical alignment. This segmentation allows mirrors to be cleaned without permanently affixing them to the entire cell structure.
2Manufacturing precision
If a single-piece machined cell is used, then the manufacturing precision and alignment are improved, but the device complexity and cost increase significantly for longer cells
Solution Approach 1:
Instead of machining a single-piece cell, the design segments the cell into a tube and separate end-caps. This reduces machining complexity because each component can be manufactured independently with standard tolerances, and the tube does not require complex long-bore machining for cells longer than 30 cm.
Solution Approach 2:
The tube acts as an intermediary component that connects the end-caps and maintains the optical path. The tube provides mechanical support and alignment reference without requiring the end-caps to be permanently fixed, enabling easy mirror access while maintaining precision.
3Strength
If welded end-caps are used, then the structural strength is improved, but the manufacturing precision deteriorates due to heat stress bending
Solution Approach 1:
The welding process is extracted from the assembly process. Instead of welding end-caps to the tube, the design uses mechanical attachment methods (such as threaded connections or interference fits) that avoid heat stress. This eliminates the heat-induced bending that would compromise concentricity and parallelism while still providing sufficient structural strength.
Data Source
AI summary
An optical cavity includes a cell having at least one structure with a first end and a second end, a first end-cap configured to removably receive a first mirror, and a second end-cap configured to removably receive a second mirror. The first end-cap is attached to the structure at the first end and has an opening with a center axis. The second end-cap is attached to the structure at the second end and has an opening with a center axis that is axially aligned with the center axis of the first end-cap. The cell can be a closed cell, wherein the structure is a tube axially aligned with the center axis. The cell can be an open cell, wherein the structure is a tube that includes one or more openings through its wall. The cell can be an open cell, wherein the structure includes one or more rods, each off axis from the center axis.