Laser Bypass Optics for Faster Pulse Width Stretcher Diagnosis
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Solution Overview
Problem
Semiconductor exposure apparatuses face challenges in maintaining resolution due to chromatic aberrations caused by wide spectral linewidths of laser light, necessitating a line narrowing module, which can lead to increased maintenance time and production line stoppages when identifying abnormal laser performance.
Innovation Solution
A bypass apparatus is attached to the laser apparatus, forming a bypass optical path that bypasses the pulse width stretching apparatus, utilizing highly reflective mirrors to guide laser light through a separate path, allowing for rapid identification of abnormal laser performance without altering optical axes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a line narrowing module is provided in the laser resonator to narrow the spectral linewidth, then chromatic aberrations are reduced and resolution is improved, but maintenance time increases and production line stoppages occur when identifying abnormal laser performance
Solution Approach 1:
The optical path is segmented into a main path through the pulse width stretching apparatus and a bypass path. The bypass apparatus with highly reflective mirrors creates a separate optical route that allows laser light to bypass the pulse width stretching apparatus, enabling independent testing and maintenance of different components without affecting the entire system.
Solution Approach 2:
The bypass apparatus acts as an intermediary component that provides an alternative optical path. When the pulse width stretching apparatus needs maintenance or testing, the bypass apparatus mediates by routing laser light through its own optical path with highly reflective mirrors, allowing continued operation or isolated testing without disrupting the main system.
2Duration of action of moving object
If the pulse width stretching apparatus is used to stretch the pulse width of laser light, then the desired pulse characteristics are achieved, but identification of abnormal performance requires system shutdown and component removal
Solution Approach 1:
The system dynamically switches between two operational modes: normal mode where laser light passes through the pulse width stretching apparatus to achieve desired pulse characteristics, and testing mode where the bypass apparatus is activated to route light through its optical path. This dynamic switching capability allows flexible operation and simplified troubleshooting without physical reconfiguration.
Solution Approach 2:
The bypass apparatus is pre-configured with highly reflective mirrors and an enclosure before any abnormal performance occurs. This preliminary preparation ensures that when testing is needed, the alternative path is already in place and can be activated immediately without requiring disassembly, removal, or reconfiguration of components.
3Loss of time
If a bypass apparatus with multiple optical elements is introduced, then rapid identification of abnormal performance is enabled, but device complexity increases
Solution Approach 1:
The bypass apparatus uses an enclosure that houses all the optical elements (highly reflective mirrors and other components) in a compact, integrated structure. This enclosure acts as a self-contained module that can be added to the existing system without requiring complex integration, reducing the perceived complexity while enabling rapid identification of abnormal performance through the alternative optical path.
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 quick identification of abnormal laser performance causes, reducing maintenance time and allowing selection between pulse width and output, thereby enhancing the practical performance of the laser apparatus.
Implementation Method 1
a first highly reflective mirror configured to reflect the pulse laser light entering the pulse width stretching apparatus out of the pulse width stretching apparatus, the first highly reflective mirror being configured to guide the reflected pulse laser light to the bypass optical path
Implementation Method 2
a second highly reflective mirror configured to reflect the pulse laser light reflected off the first highly reflective mirror and incident on the second highly reflective mirror through the bypass optical path to cause the reflected pulse laser light to return to a light-exiting-side optical path
Data Source
AI summary
A maintenance method of a laser apparatus including a laser oscillator configured to output pulse laser light and a pulse width stretching apparatus configured to stretch a pulse width of the pulse laser light having entered the pulse width stretching apparatus, the maintenance method comprising: attaching, when an abnormality occurs in laser performance of the pulse laser light output from the laser apparatus, a bypass apparatus to the laser apparatus, the bypass apparatus constituting a bypass optical path that bypasses the pulse width stretching apparatus.