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Surface ripple suppression in subaperture polishing with fragment-type tool paths
Applied Optics
|August 18, 2018
Summary
Optimizing tool paths for subaperture polishing of high-power laser optics is crucial. A novel random fractal-like path effectively reduces surface ripples compared to traditional methods.
Area of Science:
- Optical Engineering
- Materials Science
- Manufacturing Processes
Background:
- Subaperture polishing is essential for high-power laser optics.
- Ripple-induced effects can degrade optical performance.
- Optimizing tool paths is key to mitigating these effects.
Purpose of the Study:
- To investigate and optimize tool paths for reducing ripple-induced effects in subaperture polishing.
- To introduce and detail a novel algorithm for generating random fractal-like tool paths.
- To compare the effectiveness of fragment-type paths against traditional scanning paths.
Main Methods:
- Design of various fragment-type curves, including fractal and fractal-like unicursal curves, as tool paths.
- Development and detailed explanation of a novel algorithm for generating random fractal-like tool paths.
- Experimental validation using a computer numerical control (CNC) machine.
Main Results:
- Fragment-type paths offer multi-directionality, improving surface texture smoothing and restraining ripples.
- Repetitive use of a single fractal path can worsen surface ripples.
- Combinations of fractal paths or the random fractal-like path efficiently restrain surface ripples.
- Pitch pads demonstrated a superior ripple-smoothing effect compared to polyurethane pads.
Conclusions:
- The proposed random fractal-like path is highly effective in restraining surface ripples due to its randomness, boundary adaptation, and step-length arbitrariness.
- This novel path offers flexibility and power for iterative polishing processes.
- The findings are highly promising for the manufacture of high-power laser optics requiring extremely low surface ripples.
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