Cathode sputtered He-Zn laser

M. Jánossy, P. Mezei

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The operating characteristics of a slotted hollow cathode He-Zn laser were investigated. The Zn vapour was produced by sputtering in a slotted hollow cathode, consisting of four modules each of length 10 cm and slot size 2 mm x 5 mm. For excitation a pulsed discharge current of up to 10 A with a pulse duration 0.1-1 ms and pulse repetition rate of 5 p/s was used. The minimum threshold currents for the Zn II transitions observed were 0.4 A (758.8 nm), 1.6 A (747.9 nm), 0.7 A (492.4 nm) and 1.5 A (491.2 nm). These values are comparable with those of a similar sized heated laser. The influence of the discharge parameters and that of Ne, Ar and Kr on the laser intensity were studied in detail. A small quantity of Ar or Kr significantly increased the 492.4 nm, 491.2 nm and 758.8 nm laser power, while the power at 747.9 nm increased slightly. Addition of Ne quenched laser oscillation on the blue lines. The results are discussed on the basis of the excitation mechanisms for the different Zn II transitions. Quenching of the two blue laser lines is attributed to lower level excitation via charge transfer collisions with Ne ions. The cross section for this process is in the order of 10-15 cm2, which indicates a possibility for laser action on the 210 nm Zn II line. The maximum laser power obtained was 78 mW for the infrared lines and 72 mW for the blue lines.

Original languageEnglish
Pages (from-to)47-52
Number of pages6
JournalApplied Physics B: Lasers and Optics
Volume66
Issue number1
Publication statusPublished - 1998

Fingerprint

cathodes
lasers
hollow cathodes
excitation
pulse repetition rate
threshold currents
slots
pulse duration
modules
sputtering
quenching
charge transfer
vapors
oscillations
collisions
cross sections
ions

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Atomic and Molecular Physics, and Optics

Cite this

Cathode sputtered He-Zn laser. / Jánossy, M.; Mezei, P.

In: Applied Physics B: Lasers and Optics, Vol. 66, No. 1, 1998, p. 47-52.

Research output: Contribution to journalArticle

Jánossy, M. ; Mezei, P. / Cathode sputtered He-Zn laser. In: Applied Physics B: Lasers and Optics. 1998 ; Vol. 66, No. 1. pp. 47-52.
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