A new technological development, the laser driven light source (LDLS), in which a laser excited plasma emits intense
continuum radiation over a wide wavelength range from well below the atmospheric cut-off up to 800 nm, promises to
greatly improve our ability to provide high quality flat-fields for astronomical spectrographs. Its particular strength lies
in the ground-based ultraviolet (UV). We report on tests conducted with a LDLS using FORS2, UVES, X-Shooter and
CRIRES at ESO’s Very Large Telescope (VLT) in August 2013. Comparison with standard calibration sources such as
halogen and deuterium lamps shows that with the LDLS flat-fields with a better balanced dynamic range and excellent
signal to noise ratio can be achieved within short exposure times. This will enable higher quality science at the short
wavelength end of existing spectrographs at the VLT. Furthermore the LDLS provides exceptional stability and long
lifetime as important operational aspects. Optimised UV spectrographs such as the proposed CUBES (wavelength range
300-400 nm) project will be able to take full advantage of this development removing the long-standing limitation of
signal to noise ratios of UV flat-fields.
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