Excimer Laser Mirror Assembly for Stable Line Narrowing
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Solution Overview
Problem
Chromatic aberration in KrF and ArF excimer laser devices due to wide spectral line widths leads to decreased resolution in semiconductor exposure, necessitating a narrower spectral line width to ignore aberration.
Innovation Solution
Incorporation of a line narrowing module with a line narrowing element in the laser resonator to reduce spectral line width, combined with a movable mirror system stabilized by an elastic connecting mechanism to ensure stable laser output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a line narrowing module is added to the laser resonator to narrow the spectral line width, then chromatic aberration is reduced, but device complexity increases
Solution Approach 1:
An elastic connecting portion is introduced as an intermediary element between the holding portion and the frame member. This elastic connector mediates the mechanical connection, providing vibration isolation and shock absorption while maintaining the structural integrity of the line narrowing module assembly, thereby protecting the optical system from external disturbances
2Adaptability or versatility
If a movable mirror system is used to adjust the optical path, then adaptability is improved, but stability deteriorates due to vibrations and positional shifts
Solution Approach 1:
The elastic connecting portion serves as a pre-configured cushioning element that absorbs vibrations and shocks before they can affect the mirror's positional stability. By incorporating this damping mechanism in advance, the system maintains reliability while preserving the adaptability of the movable mirror system for optical path adjustment
3Reliability
If rigid connections are used to ensure structural stability, then stability is improved, but vibration and shock resistance deteriorate
Solution Approach 1:
The elastic connecting portion functions as a flexible mechanical element that replaces rigid connections. This flexible connector allows the structure to accommodate vibrations and shocks while maintaining overall stability, protecting the optical components from harmful mechanical disturbances
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
Stabilizes laser output and reduces chromatic aberration, enabling improved resolution in semiconductor exposure processes.
Implementation Method 1
an elastic connecting portion configured to connect the holding portion and the frame member with an elastic force
Implementation Method 2
a mirror disposed outside the chamber device and configured to reflect a part of the light output from the chamber device
Implementation Method 3
the chamber device being configured to output, to outside through a window, light generated from the laser gas by a voltage being applied to the electrode
Data Source
AI summary
A gas laser device includes a chamber device including an electrode inside the chamber device in which a laser gas is sealed and configured to output, to outside through a window, light generated from the laser gas by a voltage being applied to the electrode, a mirror disposed outside the chamber device and configured to reflect a part of the light output from the chamber device, a holding portion holding the mirror and configured to be movable in a predetermined direction perpendicular to an optical axis of the light, a frame member configured to be movable in the predetermined direction and including an opening from which the mirror is exposed, a moving mechanism configured to cause the frame member to move, and an elastic connecting portion configured to connect the holding portion and the frame member with an elastic force.