PROJECTION EXPOSURE METHOD AND PROJECTION EXPOSURE SYSTEM THEREFOR
    4.
    发明申请
    PROJECTION EXPOSURE METHOD AND PROJECTION EXPOSURE SYSTEM THEREFOR 有权
    投影曝光方法和投影曝光系统

    公开(公告)号:US20090237636A1

    公开(公告)日:2009-09-24

    申请号:US12410640

    申请日:2009-03-25

    IPC分类号: G03B27/54

    摘要: In a projection exposure method, primary radiation having a center wavelength λ is generated and guided through an illumination system along an illumination path and through a projection system along a projection path. The center wavelength is varied within a wavelength variation range Δλ having a lower limit λMIN≦λ and an upper limit λMAX≧λ. A specific absorption coefficient k(λ) of at least one gaseous absorbent species selected from the group consisting of oxygen (O2), ozone (O3) and water vapor (H2O) present in at least one gas-filled space along at least one of the illumination path and the projection path varies between a minimum absorption coefficient kMIN and a maximum absorption coefficient kMAX within the wavelength variation range such that an absorption ratio (kMAX/kMIN) exceeds 10. A concentration of the absorbent species within the gas-filled space is controlled such that an overall absorption variation effected by the absorbent species for all rays running along differing ray paths towards the image field is maintained below a predetermined absorption variation threshold value.

    摘要翻译: 在投影曝光方法中,产生具有中心波长λ的初级辐射并沿着照明路径通过照明系统并沿着投影路径通过投影系统。 中心波长在具有下限λMIN<=λ和上限λMAX> =λ的波长变化范围Deltalambda内变化。 至少一种选自氧(O 2),臭氧(O 3)和水蒸汽(H 2 O)的气体吸收剂物质的吸收系数k(λ)至少存在于至少一个气体填充空间中, 照射路径和投影路径在波长变化范围内的最小吸收系数kMIN和最大吸收系数kMAX之间变化,使得吸收比(kMAX / kMIN)超过10。气体填充空间内的吸收物质的浓度 被控制为使得沿着沿着不同光线路朝着图像场行进的所有射线的吸收物质的整体吸收变化保持在预定吸收变化阈值以下。