Abstract:
A device for UV curing a coating or printed ink on an workpiece such as an optical fiber comprises dual elliptical reflectors arranged to have a co-located focus. The workpiece is centered at the co-located focus such that the dual elliptical reflectors are disposed on opposing sides of the workpiece. Two separate light sources are positioned at a second focus of each elliptical reflector, wherein light irradiated from the light sources is substantially concentrated onto the surface of the workpiece at the co-located focus.
Abstract:
A mirror has a substrate (112), which consists of a substrate material having a specific thermal conductivity of less than 10W/(m*K), and a reflection coating (116) applied on the substrate, said reflection coating having a reflective effect for vacuum ultraviolet radiation or radiation from the extreme ultraviolet range. A heat distribution intermediate layer (120, 220) is arranged between the substrate (112) and the reflection coating (116), said heat distribution intermediate layer consisting of a layer material having a specific thermal conductivity that is at least 10 times the magnitude of the specific thermal conductivity of the substrate material. The heat distribution intermediate layer has a layer thickness of at least 1 µm.
Abstract:
An EUV collector mirror shell of an EUV collector for EUV lithography comprises a body (42) which has a light incidence-side front part (44), having a reflective optically active area (48), and a rear part (46), and which has a cavity (50) between the front part (44) and the rear part (46), the cavity (50) extending essentially along the entire optically active area (48), and the cavity (50) serving for receiving a cooling medium, the body (42) having, furthermore, at least one inlet (54) and at least one outlet (56) for the cooling medium. A plurality of flow-influencing elements (52) are arranged, distributed, in the cavity (50), which extend from the front part (44) to the rear part (46), connect the front part (44) to the rear part (46) and are formed in one piece with the front part (44) and with the rear part (46).
Abstract:
An optical collector (15) for collecting extreme ultraviolet radiation or EUV light generated at a central EUV production site comprises a reflective shell (25). To cope with the thermal loading of the collector and thereby avoid deformations, the reflective shell (25) preferably is mounted on and supported by a support structure (24), such that a cooling channel (29) is established between the back side of the reflective shell (25) and the support structure (24), the thickness of the reflective shell (25) is substantially reduced, such that the convective heat transfer between the back side of the reflective shell (25) and a cooling medium (26) flowing through the cooling channel (29) dominates the process of removing heat from the reflective shell (25) with respect to heat conduction, and a cooling circuit (33) is connected to the cooling channel (29) to supply a cooling medium (26) to the cooling channel (29) with a controlled coolant pressure and/or mass flow.
Abstract:
Methods and apparatus for cooling mirrors in an extreme ultraviolet (EUV) lithography system using a liquid metal interface are described. According to one aspect of the present invention, an apparatus which may be used in an EUV lithography system includes a heat exchanger, a mirror assembly, and a first liquid metal interface. The heat exchanger including at least a first surface. The mirror assembly includes a first mirror block having a first mirrored surface, as well as at least a first well. Finally, the first liquid metal interface includes liquid metal which is contained in the first well. The first surface is in contact with the liquid metal such that heat may be transferred form the first mirror block to the heat exchanger.
Abstract:
A collector optical system for extreme ultraviolet (EUV) or X-ray applications, including lithography and imaging, for example at 13 5 nm, comprising a grazing incidence collector in combination with a laser produced plasma (LPP) source In one embodiment, one or more further optical elements act upon one or more laser beams used to generate the EUV or X-ray plasma source, whereby said laser beam(s) ιmpact(s) on the fuel target from a side thereof on which an intermediate focus is disposed Also disclosed is a collector for EUV and X-ray applications, in which radiation from a laser produced plasma source is reflected by the collector to an intermediate focus, the line joining the source and intermediate focus defining an optical axis, a first direction on the optical axis being defined from the source to the intermediate focus, characterised by the collector comprising one or more grazing incidence mirrors, and by the collector comprising one or more further optical elements for redirecting a received laser beam so as to be incident upon the source (a) in a second direction, opposite to said first direction, or (b) at an acute angle to said second direction The further optical elements may comprise plane or spherical mirrors and/or lenses, for example disposed on the optical axis Also disclosed is a collector for application at about 13 5 nm with Laser Produced Plasma sources, the collector comprising between 5 and 16 concentrically aligned mirrors, and preferably between 6 and 12 mirrors, that operate at grazing incidence such that the maximum grazing angle between the incident radiation and the reflective surface of the mirrors is about 30°, and more preferably about 25°, in order to allow a maximum collection angle from the source of about 40° to about 85°, and preferably about 45° to about 75° Also disclosed is an EUV lithography system comprising a radiation source, for example a LPP source, the collector, an optical condenser, and a reflective mask
Abstract:
An apparatus and method for EUV light production is disclosed which may comprise a laser produced plasma ("LPP") extreme ultraviolet ("EUV") light source control system comprising a target delivery system adapted to deliver moving plasma initiation targets and an EUV light collection optic having a focus defining a desired plasma initiation site, comprising: a target tracking and feedback system comprising: at least one imaging device providing as an output an image of a target stream track, wherein the target stream track results from the imaging speed of the camera being too slow to image individual plasma formation targets forming the target stream imaged as the target stream track; a stream track error detector detecting an error in the position of the target stream track in at least one axis generally perpendicular to the target stream track from a desired stream track intersecting the desired plasma initiation site. At least one target crossing detector may be aimed at the target track and detecting the passage of a plasma formation target through a selected point in the target track. A drive laser triggering mechanism utilizing an output of the target crossing detector to determine the timing of a drive laser trigger in order for a drive laser output pulse to intersect the plasma initiation target at a selected plasma initiation site along the target track at generally its closest approach to the desired plasma initiation site. A plasma initiation detector may be aimed at the target track and detecting the location along the target track of a plasma initiation site for a respective target. An intermediate focus illuminator may illuminate an aperture formed at the intermediate focus to image the aperture in the at least one imaging device. The at least one imaging device may be at least two imaging devices each providing an error signal related to the separation of the target track from the vertical centerline axis of the image of the intermediate focus based upon an analysis of the image in the respective one of the at least two imaging devices. A target delivery feedback and control system may comprise a target delivery unit; a target delivery displacement control mechanism displacing the target delivery mechanism at least in an axis corresponding to a first displacement error signal derived from the analysis of the image in the first imaging device and at least in an axis corresponding to a second displacement error signal derived from the analysis of the image in the second imaging device.
Abstract:
A collector optic assembly (40) for an EUV radiation source (10). The collector optic assembly (40) includes an elleptical meniscus (42) having a reflective Si/Mo coating (44) for collecting and reflecting EUV radiation (32) generated by the source (10). The meniscus (42) is machined from a single piece of silicon. The collector optic assembly (40) further includes a heat exchanger (48) that includes cooling channels (62) through which flows a liquid coolant. The heat exchanger (48) is fabricated from a plurality of machined silicon sections fused together by a glass frit bonding process. The meniscus (42) is fused to a front side of the heat exchanger (48) by a glass frit bonding process. A liquid coolant inlet manifold (70) and a liquid coolant outlet manifold (86) are also each machined from a single silicon block and are mounted to a back side of the heat exchanger (48).