Hollow cathode lamp (HCL) Thorium – Argon (ThAr). This is the lamp used on eShel and Whoppshel spectroscopes.
The large number of lines in each order of these instruments enables precise calibration. This is thebulb alone, it requires High Voltage power supply and interface cable.
This bulb is included in the Calibrations modul eShel II – it is a replacement/support part.
See the eShel II complete system for details of this fiber-optic Echelle spectroscopy solution.