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Proceedings Paper

Optimization and scaling of a pulser-sustainer discharge excited oxygen-iodine laser
Author(s): J. Bruzzese; M. Nishihara; A. Hicks; W. R. Lempert; J. W. Rich; I. V. Adamovich
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Paper Abstract

The paper discusses optimization of gain and output power and scaling of a pulser-sustainer discharge excited oxygen-iodine laser. For this, NO addition to the laser mixture and iodine vapor dissociation in an auxiliary high-voltage, nanosecond pulse duration, repetitively pulsed discharge ("side" discharge) are used. Iodine dissociation fraction generated in the side discharge and measured in the M=3 laser cavity is up to 50%. The experiments showed that additional iodine dissociation generated in the side discharge only moderately increased laser gain, by 10-15%. Parametric gain optimization by varying main discharge pressure, O2 and NO fractions in the flow, I2 flow rate, pulsed discharge frequency, and sustainer discharge power, with the side discharge in operation produced gain up to 0.08 %/cm. Two parameters that critically affect gain are the energy loading per molecule in the discharge and the NO flow rate controlling the O atom concentration in the flow. Operation at the main discharge pressure of 60 torr resulted in significantly higher gain than at 100 torr, 0.080 %/cm vs. 0.043 %/cm, due to high discharge energy loading per molecule at the lower pressure. Laser output power measured at the gain optimized conditions is 1.4 W. Experiments with a scaled-up laser with a large volume pulser-sustainer discharge (10 cm x 10 cm x 2 cm vs. 5 cm x 5 cm x 2 cm) and longer gain path (10 cm vs. 5 cm) demonstrated stable discharge operation at discharge powers up to at least 2.9 kW. Singlet delta yield and gain measurements in the scaled-up laser are underway.

Paper Details

Date Published: 12 May 2008
PDF: 9 pages
Proc. SPIE 7005, High-Power Laser Ablation VII, 70051H (12 May 2008); doi: 10.1117/12.783781
Show Author Affiliations
J. Bruzzese, The Ohio State Univ. (United States)
M. Nishihara, The Ohio State Univ. (United States)
A. Hicks, The Ohio State Univ. (United States)
W. R. Lempert, The Ohio State Univ. (United States)
J. W. Rich, The Ohio State Univ. (United States)
I. V. Adamovich, The Ohio State Univ. (United States)

Published in SPIE Proceedings Vol. 7005:
High-Power Laser Ablation VII
Claude R. Phipps, Editor(s)

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