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A GaN-based blue diode laser is employed for laser absorption spectroscopy in aluminium hollow cathode glow discharge plasma. A Littrow grating stabilised external resonator is used for tuning the wavelength of laser emission. Scanning the wavelength of the laser probes the absorption profile of aluminium transitions yielding ground state aluminium densities. Hyperfine structure has to be taken into account in order to obtain correct temperatures. The diode laser is used to investigate both the temperature and the density of aluminium atoms sputtered from a cathode surface by ion bombardment from the cathode fall region. The blue diode laser allows quick and easy access to aluminium ground state atoms at low costs.

Additional information

Authors: DINKLAGE A, Max-Planck-Institut für Plasmaphysik, EURATOM Association, Greifswald (DE);SCHNEIBER H ET AL, Institut für Physik, Ernst-Moritz-Arndt-Universität Greifswald, Greifswald (DE)
Bibliographic Reference: An article published in: Review of Scientific Instruments, 73 (2), February 2002, pp. 378-382.
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