Abstract:
A radiation source for a lithographic apparatus uses a plurality of fiber lasers to ignite a fuel droplet at an ignition location to generate EUV radiation. The fiber lasers may be provided to emit parallel to an optical axis and a telescopic optical system is provided to focus the lasers at the ignition location, or the lasers may be directed towards the optical axis with a final focus lens being used to reduce beam waist. The lasers may be provided in two or more groups to allow them to be independently controlled and some of the lasers may be focused at a different location to provide a pre-pulse. Radiation from fiber lasers may also be combined using dichroic mirrors.
Abstract:
A spectral purity filter (100) includes a substrate (111), a plurality of apertures (104) through the substrate (111), and a plurality of walls. The walls define the plurality of apertures (104) through the substrate (111). The spectral purity filter (100) also includes a first layer (112) formed on the substrate to reflect radiation of a first wavelength, and a second layer (113) formed on the first layer (112) to prevent oxidation of the first layer (112). The apertures (104) are constructed and arranged to be able to transmit at least a portion of radiation of a second wavelength there through.
Abstract:
A system for removing contaminant particles from the path of the beam of EUV radiation is provided in which at least a first AC voltage is provided to a pair of electrodes on opposite sides of the path of the beam of EUV radiation as a first stage of a regime of voltages and, as a second stage of the regime of voltages, a DC voltage is provided to the electrodes.
Abstract:
A method of generating radiation for a lithography apparatus. The method comprises providing a continuously renewing fuel target at a plasma formation location and directing a continuous-wave excitation beam at the plasma formation location such that fuel within the continuously renewing fuel target is excited by the continuous-wave excitation beam to generate a radiation generating plasma.
Abstract:
A source-collector device is constructed and arranged to generate a radiation beam, The device includes a target unit constructed and arranged to present a target surface of plasma- forming material; a laser unit constructed and arranged to generate a beam of radiation directed onto the target surface so as to form a plasma from said plasma-forming material; a contaminant trap constructed and arranged to reduce propagation of particulate contaminants generated by the plasma; a radiation collector comprising a plurality of grazing-incidence reflectors arranged to collect radiation emitted by the plasma and form a beam therefrom; and a filter constructed and arranged to attenuate at least one wavelength range of the beam.