Abstract:
Um ausgehend von einem bekannten Verfahren zur Herstellung eines Rohlings aus Titan-dotiertem, hochkieselsäurehaltigem Glas (Glas) für ein Spiegelsubstrat für den Einsatz in der EUV-Lithographie, das einen zu verspiegelnden und beim bestimmungsgemäßen Einsatz des Spiegelsubstrats als hochbelastete Zone spezifizierten Oberflächenbereich aufweist, der eine Außenkontur hat, einen Rohling bereit zu stellen, der kostengünstig herstellbar ist und der dennoch hohen Anforderungen bezüglich Homogenität, Blasen- und Schlierenfreiheit genügt, wird eine Verfahrensweise vorgeschlagen, die folgende Verfahrensschritte umfasst: (a) Erzeugen eines Frontkörpers aus Titan-dotiertem Glas hoher Qualität und mit Abmessungen, die die Außenkontur mit Übermaß umschließen, (b) Erzeugen eines zylinderförmigen Stützkörpers aus Titan-dotiertem Glas, (c) Verbinden von Frontkörper und Stützkörper unter Bildung eines Verbundkörpers, und (d) Bearbeitung des Verbundkörpers zum Spiegelsubstrat-Rohling, wobei das Erzeugen des Frontkörpers einen Homogenisierungsprozess umfasst, der ein Verdrillen eines durch Flammenhydrolyse einer siliziumhaltigen Verbindung erhaltenen stangenförmigen Ausgangskörpers zu einem Frontkörperrohling umfasst, und dass der Stützkörper als monolithischer Glasblock mit geringerer Homogenität als der Frontkörper ausgebildet ist.
Abstract:
The present invention is to provide a TiO 2 -SiO 2 glass having suitable thermal expansion properties as an optical member of an exposure tool for EUVL. The present invention relates to a TiO 2 -containing silica glass having a temperature, at which a coefficient of thermal expansion is 0 ppb/°C, falling within the range of 23 } 4 °C and a temperature width, in which a coefficient of thermal expansion is 0 } 5 ppb/°C, of 5 °C or more.
Abstract:
The invention is directed to a low expansion glass with reduced striae, the glass have a point to point variation in titania content is 0.1 wt% or less through its thickness and a CTE of 0 ± 3 ppb/°C throughout the temperature range 5-35 °C. The invention is further directed to a method for producing the low expansion glass by using a method in which the time for repetition of the oscillation patterns used in the process are 10 minutes or less. In addition, the low expansion glass of the invention can have striae further reduced by heat treating the glass at temperatures above 1600 °C for a time in the range of 48 160 hours. The invention is also directed to optical elements suitable for extreme ultraviolet lithography, which elements are made of a titania-containing silica glass having a titania content in the range of 5-10 wt.%, a polished and shaped surface have a peak to valley roughness of less than 10 nm, an average variation in titania content of less than ± 0.1 wt. % as measured through the vertical thickness of the glass and a coefficient of thermal expansion of 0 ± 3 ppb/°C throughout the temperature range 5 35 °C.
Abstract:
The present invention is to provide a processing method for manufacturing a highly flat and highly smooth glass substrate with good productivity. A highly flat and highly smooth glass substrate is obtained with good productivity by processing of a glass substrate, which comprises a step of measuring the surface shape of the glass substrate prior to processing, a step of processing the surface of the substrate by changing a processing condition for each site (first processing step), and a step of finish-polishing the surface of the glass substrate that has been subjected to the first processing step (second processing step). At that time, the processing condition for each site within the surface of the substrate in the first processing step is determined from a processing amount that is determined from the concave-convex shape of the surface of the glass substrate prior to processing and the in-plane distribution of a processing amount by the second processing step separately measured by using a similar substrate.
Abstract:
The invention relates to an electric lamp provided with a light source in a light-transmitting lamp vessel which is closed in a vacuumtight manner, which light source has an envelope of light-transmitting, UV-absorbing quartz glass which comprises silicon oxide, aluminum oxide and cerium oxide, characterized in that the quartz glass of the envelope comprises the aluminum oxide and cerium oxide in a molar ratio of between 0.30 and 0.48. The invention further relates to the quartz glass which is used for said lamp.
Abstract:
Titania-containing silica glass bodies and extreme ultraviolet elements having low levels of striae are disclosed. Methods and apparatus for manufacturing and measuring striae in glass elements and extreme ultraviolet elements are also disclosed.
Abstract:
Methods and apparatus for manufacturing titania-containing fused silica bodies are disclosed. The titania-containing fused silica bodies are subsequently processed to make extreme ultraviolet soft x-ray masks. The methods and apparatus involve providing powders external to a furnace cavity and depositing the powders in the furnace cavity to form a titania-containing fused silica body.
Abstract:
In order to reduce the degree of relaxation after an optical substrate has been compacted, in particular after a longer period, substrates (51) or reflective optical elements (50), in particular for EUV lithography, with substrates (51) of this type, are proposed. These substrates (51), which have a surface region (511) with a reflective coating (54), are characterised in that, at least near to the surface region (511), the titanium-doped quartz glass has a proportion of Si—O—O—Si bonds of at least 1*1016/cm3 and/or a proportion of Si—Si bonds of at least 1*1016/cm3 or, along a notional line (513) perpendicular to the surface region (511), over a length (517) of 500 nm or more, a hydrogen content of more than 5×1018 molecules/cm3.