Excitation Mechanisms in a Hollow Cathode Metal Vapor Laser (He-Cd+)

Periasamy, Ramalingam Excitation Mechanisms in a Hollow Cathode Metal Vapor Laser (He-Cd+). Excitation Mechanisms in a Hollow Cathode Metal Vapor Laser (He-Cd+). pp. 1-4. (Unpublished)

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Abstract

(He-Cd+) laser operating in the negative glow region of a low pressure helium discharge is to be presented. The operation conditions and parametric studies of the laser are discussed. The general excitation processes in the segmented hollow cathode (HCD) has been studied by emission spectroscopy [2]. He-Cd+ laser were able to operate in CW mode giving out seven laser transitions simultaneously [1]. The seven transitions range from two in NIR, Red and green and one in blue. The majority excitation mechanisms for blue are the electron impact excitation. The population of the He 23 S (helium metastables), being the main pump species for the blue laser increases with an increase in discharge current in a He-Cd+ discharge. The excitation mechanisms for the infrared and red lines are by charge transfer and for the two green lines it is partly by Penning and another part by radiative cascading. The electron energy distribution in a hollow cathode discharge is very highly non-Maxwellian and varies dramatically with discharge current, buffer gas pressure and radial position of a hollow cathode. The role of different mechanisms for the population of some of the upper laser levels is clarified by the results of a spectroscopic investigation.

Item Type: Article
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User: Dr. Ramalingam Periasamy
Date Deposited: 24 Apr 2016 13:33
Last Modified: 24 Apr 2016 13:33
URI: http://eprints.auis.edu.krd/id/eprint/22

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