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Summary:A collector module is disclosed comprising: a collector for collecting radiation generated by a radiation generating plasma, and for directing at least a portion of the generated radiation; a structure upstream of the focal point and extending at least partially around an expected position of a beam comprising the at least a portion of the collected radiation; a diffractive element being arranged to diffract infrared radiation that is reflected from the plasma formation location. When the plasma formation location is at an intended location, m = +1 diffracted infrared radiation is directed towards a first region of the structure. At m = -1 diffracted infrared radiation is directed towards a second region of the structure. Also disclosed is an infra-red detector with increased dynamic range obtained by providing a screen for forming an image of a hotspot and a camera directed on to the screen. The dynamic range of the detector is improved either by heating the screen such that a low intensity hotspot is raised
Bibliography:Application Number: TW20130122428