Predictive Gas Control for Laser Refill Optimization
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Solution Overview
Problem
Current gas discharge laser systems for photolithography require frequent halogen gas refills, leading to downtime and disruptions in the lithographic process due to contaminant buildup and efficiency losses, as existing control methods are conservative and unable to accurately predict refill needs.
Innovation Solution
A predictive gas control algorithm that utilizes laser operating parameters to determine a gas use model, allowing for periodic and frequent partial gas refills with a mixture of halogen and bulk gas, and adjusting the fluorine injection based on actual consumption to maintain optimal gas composition and extend the gas life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequent partial gas refills are performed to maintain optimal gas composition, then laser efficiency and beam quality are improved, but system complexity and operational overhead increase
Solution Approach 1:
The system implements a feedback control mechanism where the controller continuously monitors laser operating parameters and gas composition, then automatically adjusts gas injection rates and timing to maintain optimal conditions. This closed-loop feedback eliminates the need for complex manual intervention while preserving laser efficiency.
Solution Approach 2:
The gas control system performs self-regulation by automatically detecting when gas replenishment is needed and executing the refill process without external intervention. The controller manages the entire gas composition maintenance process autonomously, reducing operational overhead while maintaining reliability.
2Reliability
If full gas refills are performed to restore original gas composition, then laser performance is restored, but production downtime increases
Solution Approach 1:
The system performs preliminary gas replenishment by injecting halogen gas gradually during laser operation before complete depletion occurs. This proactive approach maintains gas composition within optimal ranges, preventing performance degradation and eliminating the need for disruptive full refills that cause production downtime.
Solution Approach 2:
Instead of performing occasional full refills that cause extended downtime, the system implements periodic partial gas injections at optimized intervals. This rhythmic maintenance approach continuously refreshes the gas composition with minimal disruption to laser operation and wafer production.
3Manufacturing precision
If gas composition is maintained within strict specifications, then beam quality parameters are improved, but gas consumption and refill frequency increase
Solution Approach 1:
The system applies partial action by injecting small amounts of halogen gas periodically rather than maintaining continuously high concentrations. This approach achieves the necessary beam quality parameters through cumulative small adjustments, reducing overall gas consumption compared to maintaining strictly maximum concentrations at all times.
Solution Approach 2:
The controller dynamically adjusts gas composition parameters based on real-time laser operating conditions, shot count, and performance metrics. By optimizing the balance between halogen and buffer gas concentrations according to actual needs, the system maintains bandwidth stability while minimizing excessive gas consumption and unnecessary refills.
Data Source
AI summary
A method and apparatus are disclosed which may comprise predicting the gas lifetime for a gas discharge laser light source for a photolithography process, the light source comprising a halogen containing lasing gas may comprise: utilizing at least one of a plurality of laser operating input and/or output parameters; utilizing a set of at least one parameter of utilization in the photolithography process to determine a gas use model in relation to the respective input or output parameter; predicting the end of gas life based upon the model and a measurement of the respective input or output parameter. The parameter may comprise a pulse utilization pattern. The method and apparatus may comprise performing gas management for a gas discharge laser light source for a photolithography process, the light source comprising a halogen containing lasing gas comprising: utilizing periodic and frequent partial gas refills comprising an inject comprising a mixture of halogen gas and bulk gas in generally the same ration as the premix ratio provided to the laser in a full gas refill, and in an amount less than two percent of the total gas pressure prior to the injection.