Optimum operating conditions of a hollow-cathode Au-II laser

L. Szalai, T. M. Adamowicz, A. Tokarz, G. Bánó, K. Kutasi, Z. Donkó, K. Rózsa

Research output: Contribution to journalConference article

2 Citations (Scopus)

Abstract

Laser operation on the Au-TI 282.3 nm ultraviolet transition was obtained from a high-voltage, segmented hollow-cathode (SHC) discharge tube. The excitation mechanism of the laser is charge transfer collisions of He ions and ground state Au atoms resulting from the sputtering of the gold-coated cathode. The high gain provided by the special hollow cathode construction made it possible to operate the laser with external mirrors on the ultraviolet 282.3 nm line. For the efficient pumping of the laser, high density of both He ions and Au atoms must be present in the discharge. Increased cathode spuuering, thus higher Au atom density can be achieved using a small amount of a heavier noble gas (e.g. Ar) in the helium buffer gas. On the other hand, the presence of Ar-due to its low ionization potential and high ionization cross section-reduces the energy of electrons and thus the ionization rate of helium. Measurements of the laser power and small signal gain indicate that the optimum partial pressure ofargon is in the order ofO.25-0.75 %.

Original languageEnglish
Pages (from-to)28-31
Number of pages4
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume3573
DOIs
Publication statusPublished - Aug 19 1998
Event5th Congress on Modern Optics, OPTIKA 1998 - Budapest, Hungary
Duration: Sep 14 1998Sep 17 1998

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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