Light Source Parameter Management for Excimer Laser Consumable Life
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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 light sources like KrF and ArF excimer lasers, necessitating line narrowing modules, which can be inefficient in managing consumable life and operational parameters.
Innovation Solution
A light source parameter information management system that acquires priority target parameter information, estimates maintenance information based on this data, and outputs consumable life until maintenance, using a processor, memory, and computer readable medium to manage light source parameters effectively.
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 device complexity and operational inefficiency increase
Solution Approach 1:
The patent extracts the line narrowing function from the physical line narrowing module (etalon or grating) and implements it through software-based spectral linewidth control. The control unit monitors and adjusts laser operating parameters to achieve the desired spectral linewidth without requiring additional optical components, thereby removing the complex hardware while preserving the resolution benefit.
Solution Approach 2:
The patent replaces the mechanical/optical line narrowing module with a control system that uses software algorithms to manage spectral linewidth. Instead of using physical etalons or gratings to narrow the linewidth, the system uses computational methods to monitor and adjust laser parameters, substituting a mechanical/optical system with an electronic/control-based system.
2Manufacturing 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 operational efficiency decreases
Solution Approach 1:
The patent removes the line narrowing module from the optical path and extracts its functional requirement (spectral linewidth control) to be managed by software. This eliminates the operational overhead and maintenance requirements associated with physical line narrowing components while achieving the same resolution improvement through control algorithms.
Solution Approach 2:
The patent substitutes the mechanical line narrowing module with a control system that manages spectral linewidth through software-based monitoring and adjustment of laser operating parameters. This replacement improves operational efficiency by eliminating the need for manual alignment, cleaning, and maintenance of optical components while maintaining the resolution benefit.
3Reliability
If conventional light source parameter management is used, then basic operation is maintained, but consumable life management and operational efficiency are suboptimal
Solution Approach 1:
The patent implements a feedback mechanism where the control unit continuously monitors light source operating parameters and compares them against optimal values. Based on this feedback, the system automatically adjusts parameters to extend consumable life while maintaining operational efficiency, creating a closed-loop management system that optimizes both reliability and productivity.
Solution Approach 2:
The patent enables the light source management system to automatically monitor, analyze, and adjust its own operating parameters without external intervention. The control unit self-manages consumable life by detecting degradation trends and autonomously optimizing operational parameters, reducing the need for manual maintenance while improving overall operational efficiency.
Data Source
AI summary
A light source parameter information management method for managing information on a parameter of a light source used in an exposure apparatus, the method including acquiring priority target parameter information containing an item of a variable that is a priority target parameter prioritized in the operation of the light source, and a target value of the variable, estimating maintenance information based on the priority target parameter information, the maintenance information containing a value representing the life of a consumable in the light source until maintenance of the consumable, and outputting the maintenance information.