Laser frequency combs, producing a dense grid of equidistant optical emission lines, are considered the best calibration sources for precision astronomical spectrographs. The recently commissioned Near-Infra-Red Planet Searcher (NIRPS), operating at the 3.6m telescope in La Silla, Chile, will be equipped with an astrocomb for the wavelength calibration in the 1200nm – 1850nm range. The astrocomb is based on the electro-optic modulation technology and offers tunability of the full optical spectrum.
|