Apparatus and method for generating extreme ultraviolet radiation

    公开(公告)号:US10342109B2

    公开(公告)日:2019-07-02

    申请号:US15906574

    申请日:2018-02-27

    IPC分类号: H05G2/00 G21K5/00

    摘要: A method of controlling an excitation laser includes detecting, at a droplet generator, a first signal of radiation scattered by a given target droplet irradiated by a first radiation source at a first position. The method of controlling the excitation laser further includes detecting, at the droplet generator, a second signal of radiation scattered by the given target droplet irradiated by a second radiation source at a second position a fixed distance away from the first position, and determining a speed of the given target droplet based on a time lag between the detecting of the first signal and the detecting of the second signal. The method further includes controlling a trigger time for triggering an excitation pulse for heating the given target droplet based on the determined speed of the given target droplet.