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Abstract

An extreme ultraviolet (EUV) light generating device includes a vessel having an internal space, a droplet generator generating droplets to be supplied to the internal space, a droplet emitter emitting the droplets generated by the droplet generator to the internal space, a laser light source generating a laser beam to generate EUV light by reaction with the droplets, a condensing mirror adjacent to the laser light source to at least partially surround the laser light source and concentrating EUV light on an intermediate focus (IF), and gas lock nozzles around the IF to respectively constitute rows and ejecting a flow control gas to the internal space, wherein a tilted direction of a gas lock nozzle in at least one of the rows is tilted in a direction consistent with a tilted direction of a sidewall of the vessel with respect to a central axis direction of the internal space.

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First Claim