Characteristics of the gain medium for an ejector COIL with supersonic nozzles for the driver buffer gas |
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| Authors: | MV Zagidullin VD Nikolaev MI Svistun NA Khvatov GD Hager |
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| Institution: | (1) Lebedev Physical Institute, Samara Branch, Novosadovaya 221, Samara, Russia, 443011;(2) AFRL/Directed Energy Directorate, US Air Force Research Laboratory, Kirtland AFB, NM 87117, 3550 Aberdeen Ave. SE, Kirtland AFB, NM USA, 87117-5776 |
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| Abstract: | The use of supersonic nozzles for the driver nitrogen in an ejector nozzle bank (ENB) for chemical-oxygen iodine laser (COIL) resulted in the elimination of the chocking effect for the primary oxygen flow and formation of a low temperature gain medium. The ENB generates a supersonic gain medium with a Mach number greater than 2.2, and a temperature less than 200 K. The potential recovered pressure was 90 Torr with a small signal gain greater than 10-2 cm-1. With a 5 cm gain length for this nozzle, the output power was 1.2 kW with a chemical efficiency of 23.4%. A strong decay of I(2P1/2) emission, (concentration), along the gain medium flow was observed . PACS 42.55.Ks |
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