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    • 23. 发明公开
    • LASER OUTPUT LIGHT PULSE STRETCHER
    • 激光输出光脉冲STRAIGHTENER
    • EP1692750A4
    • 2007-07-11
    • EP04800552
    • 2004-11-01
    • CYMER INC
    • SMITH SCOT TERSHOV ALEXANDER ILUKASHEV ALEXEI
    • H01S3/223H01S3/00H01S3/225
    • G03F7/7055H01S3/0057H01S3/225
    • An apparatus and method for providing a high peak power short pulse duration gas discharge laser comprising a pulse stretcher which may comprise a laser output pulse optical delay initiating optic diverting a portion of the output laser pulse into an optical delay having an optical delay path and comprising; a plurality of confocal resonators in series aligned to deliver an output of the optical delay to the laser output pulse optical delay initiating optic. The plurality of confocal resonators comprises four confocal resonators may comprise a first spherical having a radius of curvature a second concave spherical mirror having the same radius of curvature and separated from the first concave spherical mirror by the radius of curvature and receiving the first reflected beam at a first point on a face of the second concave spherical mirror and generating a second reflected beam incident on a second point on the face of the first concave spherical mirror, the second reflected beam being reflected by the first concave spherical mirror from the second point on the first mirror to form an output beam from the first confocal resonator cell; and, a second confocal resonator cell receiving the output beam of the first confocal resonator cell as an input beam of the second confocal resonator cell. The apparatus and method may comprise a plurality, e.g., two pulse stretchers in series and may include spatial coherency metrology.
    • 25. 发明公开
    • GAS DISCHARGE LASER CHAMBER IMPROVEMENTS
    • 气体放电激光器室的改进
    • EP1754291A2
    • 2007-02-21
    • EP05733083.9
    • 2005-03-03
    • Cymer, Inc.
    • PARTLO, William, N.AMADA, YoshihoCARMICHAEL, James, A.DYER, Timothy, S.GILLESPIE, Walter, D.MOOSMAN, Bryan, G.RETTIG, Curtis, L.STRATE, Brian, D.STEIGER, Thomas, D.TRINTCHOUK, Fedor, B.UJAZDOWSKI, Richard, C.
    • H01S3/22
    • H01S3/036H01S3/0384H01S3/041H01S3/0971H01S3/225
    • A method and apparatus if disclosed which may comprise a high power high repetition rate gas discharge laser UV light source which may comprise: a gas discharge chamber comprising an interior wall comprising a vertical wall and an adjacent bottom wall; a gas circulation fan creating a gas flow path adjacent the interior vertical wall and the adjacent bottom wall; an in-chamber dust trap positioned a region of low gas flow, which may be along an interior wall and may comprise at least one meshed screen, e.g., a plurality of meshed screens, which may comprise at least two different gauge meshed screens. The dust trap may extend along the bottom interior wall of the chamber and/or a vertical portion of the interior wall. The dust trap may comprise a first meshed screen having a first gauge; a second meshed screen having a second gauge smaller than the first gauge; and the second meshed screen intermediate the first meshed screen and the interior wall. The chamber may comprise a plurality of dust collecting recesses in at least one of the vertical interior wall and the bottom wall of the chamber which may be selected from a group comprising a one-part recess and a multi-part recess, which may comprise two sections angled with respect to each other. The dust trap may comprise a pressure trap positioned between a portion of a main insulator and an interior wall of the chamber. The chamber may comprise a gas circulating fan comprising a cross-flow fan with a fan cutoff that may comprise a vortex control pocket. The chamber may comprise a preionization mechanism comprising a preionization tub containing a ground rod within an elongated opening in the preionization tube that may comprise a compliant member, an automatic preionization shut-off mechanism, a preionization onset control mechanism and/or a focusing element. The chamber may comprise an elongated baffle plate that may comprise a plurality of pyramidal structures including varying numbers of generally pyramidal elements and oriented in groups of varying numbers of generally pyramidal elements and oriented along and transverse to the longitudinal axis. Acoustic resonances within the chamber may also be reduced by introducing an artificial fitter into the timing of the laser discharges varying the inter-pulse period randomly or in a repeating pattern from pulse to pulse within a burst.