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7 June 1999 COIL with longitudinal pumping out and small iodine flow rate
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The axial flow COIL is a convenient device to study the gain and storage energy life-length along the gas flow. When the velocity of the axial flow close to the sonic velocity and the active medium is preliminary cooled the conditions like in the supersonic transverse flow COIL can be realized. The presented axial flow COIL was driven by jet type SOG. The next gas flow rates were used in all experiments: 20 mmole/s of the primary buffer gas, 10 mmole/s of secondary buffer gas and 10 mmole/s of chlorine through the jet SOG. The maximum output power 106 wt was obtained at ~0.05 mmole/s of the iodine flow rate with primary and secondary nitrogen buffer gas. The cooling of the primary nitrogen to 80°K resulted in 130 wt output power. The using helium at 80°K instead of nitrogen resulted in 186 wt output power or 20.5% total chemical efficiency for 0.1 mmole/s of the iodine flow rate. The exposition of the laser beam at the black wood target showed that the main part of laser power was inside the circle 22 mm in diameter.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Marsel V. Zagidullin and Valeri D. Nikolaev "COIL with longitudinal pumping out and small iodine flow rate", Proc. SPIE 3612, Gas and Chemical Lasers and Intense Beam Applications II, (7 June 1999);


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