Article ID Journal Published Year Pages File Type
733150 Optics & Laser Technology 2007 7 Pages PDF
Abstract

Experimental and theoretical study of V–I characteristics of UV pre-ionized TEA CO2 laser has been carried out for a variety of gas mixtures emitting different optical pulse shapes suitable for various applications. Coupled differential equations have been solved to model the pulse excitation circuit using the numerically calculated values of ionization coefficient (αα), attachment coefficient (ββ) and drift velocity (UdUd) as functions of E/N (i.e. electric field to neutral particle density ratio) for chosen gas mixture. Calculated and experimental V–I characteristics for gas mixtures (CO2:N2:He::1:2:3, 1:1:4, 1:1:5 and 1:0:4.7) show a good agreement. It has been shown that gas mixture has a dominant effect on the delay between pre-ionization and main discharge; thus, determining the long-term stability of discharge. The excitation pulse duration increases with increase in molecular content of gas mixture (i.e. amount of CO2 and N2 in gas mixture).

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Physical Sciences and Engineering Engineering Electrical and Electronic Engineering
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