Dynamic Ion Beam Polishing for High-Precision Optical Figuring
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Solution Overview
Problem
Existing ion beam polishing methods struggle with high-precision figuring and mass trimming of optical components, particularly hemispherical resonators, due to limitations in dynamic performance, accuracy, and the introduction of damaged layers, which affect the optical performance and efficiency.
Innovation Solution
A dynamically controllable ultrawide-amplitude and high-response ion source method that establishes a removal function database to dynamically adjust ion beam machining parameters, including dwell time, velocity, and process parameters of the ion source, to achieve real-time control of the removal function, reducing the requirement on the machine tool's movement system and minimizing the damaged layer depth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the beam diameter is changed by adding diaphragms to obtain different removal functions, then the multi-band surface errors can be addressed, but the preparation time increases and the clamping error is introduced
Solution Approach 1:
The patent applies dynamics by making the ion beam diameter dynamically adjustable through electromagnetic field control rather than static diaphragms. The ion source can change beam diameter on-demand during machining without physical component changes, resolving the contradiction between handling multi-band errors and minimizing preparation time
Solution Approach 2:
The patent changes the physical parameters of the ion beam (diameter, current, energy) through electromagnetic control to achieve different removal functions. This allows continuous adjustment of beam characteristics without mechanical intervention, eliminating diaphragm changes and associated preparation time
2Adaptability or versatility
If the beam diameter is changed by adding diaphragms, then different removal functions are obtained, but the components are remeasured and clamped repeatedly which reduces figuring precision
Solution Approach 1:
The ion beam system is made dynamically controllable with real-time adjustment of beam diameter and other parameters. This eliminates the need to physically change diaphragms and re-clamp components, maintaining both adaptability and precision throughout the machining process
Solution Approach 2:
The ion source is designed to perform multiple functions (different beam diameters, various removal rates) through a single unified system with electromagnetic control. This universal capability replaces multiple specialized diaphragms while eliminating the need for repeated component handling
3Manufacturing precision
If the machine tool acceleration is insufficient for high-gradient error figuring, then the surface cannot reach convergence, but increasing acceleration may cause other issues
Solution Approach 1:
The patent changes the removal function parameters (beam diameter, current density, dwell time) to match the error gradient characteristics. For high-gradient errors, the system uses smaller beam diameters with higher current density, allowing effective machining without requiring excessive machine tool acceleration
Solution Approach 2:
The system dynamically adjusts the removal function parameters during machining based on the error map and gradient analysis. This adaptive control allows the ion beam to effectively address high-gradient errors through parameter optimization rather than relying solely on machine tool acceleration
4Ease of operation
If extra removal amount is increased to reduce machine tool acceleration requirements, then the optical performance on surfaces deteriorates
Solution Approach 1:
The patent precisely controls ion beam parameters (current, energy, diameter, dwell time) to achieve the exact removal amount needed. This eliminates the need to increase extra removal amount, maintaining both ease of operation and optical performance through accurate parameter matching
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 method enhances the precision and efficiency of ion beam polishing, improves the operability and economic feasibility, and effectively controls multi-band surface errors, enabling high-precision figuring and mass trimming with reduced damaged layers and improved optical performance.
Implementation Method 1
The basic principle of ion beam polishing is to bombard an optical surface with energetic ions, such that the complex collisions of ions with surface atoms take place, and there is exchange of momentum and energy with material atoms through the collisions. After obtaining enough energy, the collided surface atoms can get rid of constraints of surface energy and break away from the workpiece surface, thereby removing the materials atomically.
Data Source
AI summary
The present disclosure provides a system and method for controlling a dynamically controllable ultrawide-amplitude and high-response ion source, including: resolving dwell time of ion beam machining during iterative machining; selecting an appropriate velocity V of a movable shaft of a machine tool according to a calculation result of the dwell time; and dynamically calculating process parameters of an ion source according to an initial surface error of an optical component and the velocity V of the movable shaft, and generating a corresponding numerical control (NC) program to machine the optical component. The present disclosure can control the removal function of the ion beam polishing in real time, improve the precision and efficiency of the ion beam polishing, and further reduce the requirement on a movement system of the machine tool and the depth of a damaged layer.