Transparent Screen for Laser Optics in Vacuum
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Solution Overview
Problem
Laser ablation in charged particle beam systems results in debris buildup on laser optics, degrading performance due to the vacuum environment, where conventional debris mitigation methods are impractical and charging effects from insulating materials further complicate the issue.
Innovation Solution
A protective transparent screen, potentially coated with a conductive material, is used to shield laser optical components, allowing for easy replacement or repositioning without breaking vacuum and preventing charging effects, while a beam splitter and detector monitor and adjust the screen to maintain optimal laser power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective screen is used to shield laser optics from debris, then laser performance is maintained, but the device complexity increases
Solution Approach 1:
A transparent protective screen is introduced as an intermediary element between the laser optics and the debris source. The screen allows laser light to pass through while blocking debris particles, thus protecting the optics without requiring complex active cleaning or replacement mechanisms.
Solution Approach 2:
The protective screen is implemented as a thin, transparent film or shell that can be easily positioned and removed. This thin-film approach minimizes interference with the laser beam while providing effective debris protection, avoiding the need for bulky protective structures.
2Productivity
If laser beam power is increased to improve material removal rate, then productivity increases, but debris generation increases causing optics contamination
Solution Approach 1:
The protective screen transforms the harmful effect of high-power laser-generated debris into a manageable issue. By placing the screen between the debris source and the optics, the system can operate at high power for improved productivity while the screen captures and contains the debris, converting a system-limiting factor into a localized problem.
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
Effectively prevents debris accumulation on laser optics, maintains laser performance, and avoids charging issues, enabling reliable operation of dual beam systems within vacuum chambers.
Implementation Method 1
A protective transparent screen is used to shield the laser optical components
Implementation Method 2
potentially coated with a conductive material, is used to shield laser optical components, allowing for easy replacement or repositioning without breaking vacuum and preventing charging effects
Implementation Method 3
lasers typically have much higher material removal rates (typically up to 7×106 μm3/s for a 1 Watt laser operating at al kHz laser pulse repetition rate) than charged particle beams. Laser systems use several different mechanisms for micromachining, including laser ablation, in which energy supplied rapidly to a small volume causes atoms to be explosively expelled from the substrate
Data Source
AI summary
A method and apparatus to perform laser ablation in the vicinity of a charged particle beam while simultaneously protecting the light optical components of the apparatus utilized to perform the ablation from being coated with debris resulting from the ablation process. According to preferred embodiments of the present invention, a protective transparent screen is used to shield the laser optical components. A preferred screen could be replaced or repositioned without breaking vacuum in the sample chamber and would not be particularly susceptible to undesirable charging effects.