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In order to reduce gas consumption further, Gigaphoton has been developing new gas recycle system hTGM. hTGM purifies used gas so that laser can use it repeatedly. Field evaluation of KrF-hTGM system has been started. The system was connected to five KrF laser systems and achieved 85% of the gas recycling ratio, keeping stable laser performance. Also, internal evaluation of ArF-hTGM system has been started. The system was connected to one ArF laser and achieved 92% of the gas recycling ratio, keeping stable laser performance.
The new ArF excimer laser, GT64A has been developed to cope with the reduction of operational costs, the prevention against rare resource shortage and the improvement of device yield in multiple-patterning lithography. GT64A has advantages in efficiency and stability based on the field-proven injection-lock twin-chamber platform (GigaTwin platform). By the combination of GigaTwin platform and the advanced gas control algorithm, the consumption of rare gases such as Neon is reduced to a half. And newly designed Line Narrowing Module can realize completely Helium free operation. For the device yield improvement, spectral bandwidth stability is important to increase image contrast and contribute to the further reduction of CD variation. The new spectral bandwidth control algorithm and high response actuator has been developed to compensate the offset due to thermal change during the interval such as the period of wafer exchange operation. And REDeeM Cloud™, new monitoring system for managing light source performance and operations, is on-board and provides detailed light source information such as wavelength, energy, E95, etc.
New advanced wavelength control and bandwidth control algorithm has been developed to meet tighter stability requirement for the next generation multiple-patterning lithography.
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