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Sn-fueled high-brightness compact EUV light source

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Abstract

A compact high-brightness EUV source is needed for high-throughput actinic mask inspection in EUV lithography. Ushio is developing a light source utilizing LDP technology where rotating Sn-covered electrodes, trigger lasers and pulsed electrical discharge are employed to create an EUV-emitting plasma at as high repetition rate as 10 kHz. A unique mechanical debris-mitigation system was found to be able to stop neutral particles and reduce fast-ion flux. Clean-photon EUV radiance, of which wavelength is 13.5 nm and band width is 2 %, obtained after the debris-mitigation system was 145 W/mm2/sr. Sputter rate of Ru mirror sample was 2~5 nm/Gpulse whereas Sn deposition was found not to grow with time. Up to 5 days of non-interrupted operation was successfully demonstrated.

© 2016 Optical Society of America

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