Abstract:
A method, including printing an apparatus mark onto a structure while at least partly within an apparatus. The structure is part of, or is located on, a substrate table, but is separate from a substrate to be held by the apparatus. Measuring the apparatus mark using a sensor system within the apparatus.
Abstract:
A spectrally broadened radiation apparatus, including a laser configured to emit, through an output of the laser, radiation substantially only in the visible region of the electromagnetic spectrum, the radiation having a nominal wavelength, and an optical fiber optically coupled to the output of the laser, the optical fiber having an input to receive the radiation from the laser and having an output to provide spectrally broadened output radiation, the optical fiber configured to spectrally broaden the radiation from the laser to a spectral width of at least 0.5 nm around the nominal wavelength.