Theoretical and experimental study of V–I characteristics of UV pre-ionized TEA CO2 laser for variety of laser gas mixtures |
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Authors: | Manoj Kumar Jai Khare Chintan Gupta A.K. Nath |
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Affiliation: | aCentre for Advanced Technology, Indore 452013, India |
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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 (α), attachment coefficient (β) and drift velocity (Ud) 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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Keywords: | TEA CO2 laser V– I characteristics Modeling |
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