Power dependence of chemical oxygen-iodine lasers on iodine dissociation

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The loss of O2(1Δ) during iodine dissociation in the chemical oxygen-iodine laser (COIL) is one of the main factors affecting the output power. Analytical expression is obtained for the number of O2(1Δ) molecules, N, lost in the region of I2 dissociation per one molecule of Iz. This expression yields N = 4-6, in agreement with numerical calculations and experimental measurements. It is shown that some effective number N1 < N should be used rather than N to calculate the power. Analytical expression for the power is obtained, taking into account the O2(1Δ) losses in the dissociation region. It is shown that N increases and the power decreases when the dissociation fraction F increases. Therefore, maximum power is achieved at low values of the iodine flow rate when iodine is not completely dissociated before the resonator and when the small signal gain in the resonator region is less than its maximum achievable value. Numerical modeling of the RADICL (supersonic COIL) is carried out. The values of the O2(1Δ) yield and of the mixing rate are estimated to reach an agreement between the calculated and the measured dependencies of the power on the iodine flow rate.

Original languageEnglish
Pages (from-to)2569-2574
Number of pages6
JournalAIAA Journal
Issue number12
StatePublished - 1 Jan 1996

ASJC Scopus subject areas

  • Aerospace Engineering


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