Laser Thermal Deformation of Optical Elements
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Solution Overview
Problem
Traditional methods for shaping and polishing optical elements, such as mirrors and lenses, are time-consuming due to the need for multiple cycles between polishing, cleaning, and metrology stations, indicating a need for improved efficiency in the optical element shaping process.
Innovation Solution
A method involving the controlled heating of an optical element's surface using a laser to induce residual stress, which deforms the element into a predetermined shape, allowing for uniform or non-uniform deformation by adjusting laser characteristics like intensity, beam width, and exposure time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional polishing methods are used to shape optical elements, then manufacturing precision can be achieved, but processing time becomes excessively long due to multiple cycles between polishing, cleaning, and metrology
Solution Approach 1:
The patent replaces traditional mechanical polishing processes with laser-induced thermal stress deformation. A laser heats specific regions of the optical element to create controlled residual stress that deforms the element into the desired shape, eliminating the need for mechanical contact and multiple polishing cycles.
Solution Approach 2:
The patent changes the physical state and temperature parameters of the optical element material to enable shaping. By controlling laser heating parameters (intensity, duration, distribution), the material undergoes thermal expansion and stress-induced deformation, allowing rapid shape adjustment without mechanical removal of material.
2Productivity
If laser heating is applied to deform the optical element, then processing time is reduced, but control precision of the deformation becomes challenging
Solution Approach 1:
The patent applies laser heating locally to specific regions of the optical element rather than uniformly across the entire surface. By controlling the spatial distribution, intensity, and duration of laser exposure in different zones, precise localized deformation is achieved while maintaining overall shape control.
Solution Approach 2:
The patent incorporates metrology stations that measure the optical element's shape during and after laser processing. This measurement data feeds back to control the laser parameters, enabling real-time adjustment and precise control of the deformation process to achieve the target shape.
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
This approach significantly reduces processing time and enhances efficiency by permanently changing the optical element's shape through controlled thermal deformation, enabling precise and rapid shaping of optical elements.
Implementation Method 1
Heating can include applying a laser to the first surface
Implementation Method 2
heating a first surface of an optical element, and allowing the first surface of the optical element to cool, thereby causing residual stress in the first surface which deforms the optical element
Data Source
AI summary
A method for shaping an optical element includes heating a first surface of an optical element, and allowing the first surface of the optical element to cool, thereby causing residual stress in the first surface which deforms the optical element to a predetermined shape. Heating can include applying a laser to the first surface.