Optical Interferometry Feedback for Precise Laser Penetration Control
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Solution Overview
Problem
Current laser technologies face challenges in achieving precise axial control during material processing, particularly in surgical and industrial applications, due to limitations in controlling the depth of laser beam penetration, leading to issues such as unintended tissue damage and weld porosity.
Innovation Solution
An apparatus and method utilizing an optical interferometer to provide real-time feedback control of material processing parameters, such as beam depth and motion speed, by generating an interferometry output based on optical path lengths, allowing for precise control of laser processing in both medical and industrial contexts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If laser processing is used to achieve high transverse control and non-contact operation, then transverse control and infection control are improved, but axial control deteriorates
Solution Approach 1:
The system maintains non-contact operation while achieving precise axial control through real-time feedback from the optical interferometer. The interferometer continuously monitors the optical path length changes during laser processing, and the feedback control system adjusts the laser parameters based on these measurements, enabling precise depth control without mechanical contact or intervention
Solution Approach 2:
The patent introduces an optical interferometer as an intermediary between the laser beam and the material being processed. The interferometer acts as a mediator that measures the optical path length changes caused by beam penetration and material removal, providing indirect but precise measurement of axial position and depth without physical contact with the processing zone
2Reliability
If standard metrology techniques are used to guide laser processing, then quality assurance is improved, but measurement precision deteriorates due to plasma generation and electrical interference
Solution Approach 1:
The patent replaces electrical-based metrology techniques with optical-based interferometric measurement. Instead of using electrical sensors and signals that are susceptible to plasma generation and electrical interference, the system uses optical interferometry to measure optical path length changes, providing accurate measurement data immune to electromagnetic interference and plasma effects in the laser processing environment
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
Enables precise control of laser processing, reducing unintended tissue damage and improving weld quality by providing real-time feedback on beam penetration depth and processing parameters, enhancing both surgical precision and industrial manufacturing efficiency.
Implementation Method 1
an optical interferometer that produces an interferometry output using at least a component of the imaging light that is delivered to the sample, the interferometry output based on at least one optical path length to the sample compared to another optical path length
Data Source
AI summary
Methods and systems are provided for using optical interferometry in the context of material modification processes such as surgical laser, sintering, and welding applications. An imaging optical source that produces imaging light. A feedback controller controls at least one processing parameter of the material modification process based on an interferometry output generated using the imaging light. A method of processing interferograms is provided based on homodyne filtering. A method of generating a record of a material modification process using an interferometry output is provided.