Excimer Laser Electrode Lifetime Prediction via Energy Integration
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Solution Overview
Problem
Current excimer laser apparatuses for semiconductor exposure struggle to accurately predict the lifetime of electrodes due to varying input energy and pulse energy, leading to reduced accuracy in determining component and module lifetimes.
Innovation Solution
The proposed laser apparatus includes a controller that calculates and integrates input energies to determine if they exceed a predetermined integration lifetime value, using a pulse power module to apply short pulsed voltage between electrodes and a line narrowing module to maintain desired pulse energy, allowing for precise prediction of electrode lifetimes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a line narrowing module is mounted to narrow the spectrum line width, then chromatic distortion is reduced, but device complexity increases
Solution Approach 1:
The laser apparatus is divided into distinct functional modules: a laser chamber for generating laser beams, a line narrowing module for reducing spectral width, and a controller for managing operation. This segmentation allows each module to be optimized independently, with the line narrowing module specifically addressing chromatic distortion without requiring complete system redesign.
Solution Approach 2:
The line narrowing module is positioned to pre-process the laser beam before it reaches the exposure lens. By narrowing the spectrum line width in advance, the system prevents chromatic distortion from occurring during the exposure process, rather than attempting to correct it afterward.
2Manufacturing precision
If excimer laser apparatus is used for semiconductor exposure, then higher resolution is achieved, but electrode lifetime prediction accuracy deteriorates
Solution Approach 1:
The controller monitors operational parameters of the excimer laser apparatus and uses this feedback to dynamically adjust charging voltages and pulse intervals. This feedback mechanism ensures that the accumulated input energy remains within safe limits, enabling accurate lifetime prediction while maintaining high-resolution exposure performance.
Solution Approach 2:
The system dynamically changes operational parameters including charging voltage, pulse energy, and pulse interval based on accumulated input energy. By adjusting these parameters in real-time, the system maintains optimal resolution while preventing electrode degradation from exceeding predicted lifetime thresholds.
3Stability of the object's composition
If short pulsed voltage is applied to maintain desired pulse energy, then pulse energy stability is improved, but device complexity increases
Solution Approach 1:
The excimer laser operates by applying periodic short pulsed voltages to the electrodes, creating discrete laser pulses with controlled energy. This periodic action, combined with controlled pulse intervals, maintains stable pulse energy output while allowing the system to manage cumulative energy input through adjustable timing between pulses.
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
This solution enables accurate prediction of electrode lifetimes, ensuring stable long-term operation of excimer laser apparatuses by accounting for varying input energies and maintaining desired pulse energies, thereby improving the reliability of semiconductor exposure processes.
Implementation Method 1
a charger configured to apply a charge voltage for causing a discharge to occur between the pair of the electrodes
Implementation Method 2
a pulse power module configured to covert the charge voltage applied by the charger into a short pulsed voltage, and apply the short pulsed voltage between the pair of the electrodes
Data Source
AI summary
A laser apparatus according to embodiment may include: a laser chamber filled with a laser gain medium; a pair of electrodes disposed in the laser chamber; a charger configured to apply a charge voltage for causing a discharge to occur between the pair of the electrodes; a pulse power module configured to covert the charge voltage applied by the charger into a short pulsed voltage, and apply the short pulsed voltage between the pair of the electrodes; and a controller configured to calculate input energies Ein applied to the pair of the electrodes based on the charge voltage, calculate an integration value Einsum of the input energies Ein by integrating the calculated input energies Ein, and determine whether the integration value Einsum exceeds an integration lifetime value Einsumlife of input energy or not.