Laser Bypass Optical Path for Rapid Pulse Stretcher Fault Isolation
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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 abnormal laser performance and prolonged identification of defects.
Innovation Solution
A bypass apparatus is introduced that can be attached and detached from the laser apparatus, creating a bypass optical path to bypass the pulse width stretching apparatus, utilizing a series of highly reflective mirrors to guide laser light through an alternate path, allowing for rapid identification and switching of 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 the device complexity increases and defect identification time increases
Solution Approach 1:
The optical system is segmented into multiple functional modules: the laser resonator, the pulse width stretching apparatus, and the bypass apparatus. This segmentation allows the line narrowing function to be isolated in the resonator while providing alternative paths for optical processing, thereby managing complexity through modular design.
Solution Approach 2:
The bypass apparatus acts as an intermediary between the laser resonator and the pulse width stretching apparatus. It provides an alternative optical path that can be activated when defects occur in the pulse width stretching apparatus, enabling rapid defect identification without disrupting the entire system.
2Productivity
If a bypass apparatus is introduced to rapidly identify defects, then downtime is reduced and productivity is improved, but the device complexity increases
Solution Approach 1:
The bypass apparatus serves as an intermediary diagnostic tool that can be quickly deployed to identify defects in the pulse width stretching apparatus. By providing an alternative optical path, it enables rapid troubleshooting and defect identification, minimizing downtime and maintaining high productivity.
Solution Approach 2:
The optical system is designed to be dynamic, allowing the optical path to be switched between the pulse width stretching apparatus and the bypass apparatus. This dynamic reconfiguration capability enables rapid defect identification while maintaining system productivity, as the bypass can be activated quickly when needed.
3Reliability
If the pulse width stretching apparatus is used to stretch the pulse width, then the laser performance is improved, but the time required for defect identification increases
Solution Approach 1:
The bypass apparatus acts as an intermediary diagnostic path that bypasses the pulse width stretching apparatus. When defects occur in the stretching apparatus, the bypass allows rapid identification of the problem by providing an alternative optical path, significantly reducing defect identification time while the stretching apparatus continues to provide reliable laser performance.
Solution Approach 2:
The system is segmented into distinct functional components with the bypass apparatus providing an independent diagnostic path. This segmentation allows the pulse width stretching function to be isolated and tested separately, enabling rapid defect identification without affecting the overall laser performance provided by other system components.
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
Facilitates quick identification and resolution of abnormal laser performance by allowing selection between pulse width and output, reducing downtime and maintaining practical performance by avoiding complex optical axis adjustments.
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
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 bypass apparatus is attachable to and detachable from a laser apparatus, and constitutes a bypass optical path bypassing a pulse width stretching apparatus stretching the pulse width of pulse laser light having entered the pulse width stretching apparatus, the bypass apparatus including optical elements constituting the bypass optical path, and an enclosure housing the optical elements, the optical elements including a first highly reflective mirror that reflects the pulse laser light entering the pulse width stretching apparatus out of the pulse width stretching apparatus and that guides the reflected pulse laser light to the bypass optical path, and a second highly reflective mirror reflecting 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 of the pulse width stretching apparatus.