Cart (Loading....) | Create Account
Close category search window
 

O2(1δ) and i(2p1/2) production in flowing afterglows for oxygen-iodine lasers: effect of no/no2 additives

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)

Summary form only given. The chemical oxygen-iodine laser operates on the 1.315 mum I(1P12) rarr I(2P32) transition in atomic iodine; and is pumped by reactions between O2(1Delta) and molecular and atomic iodine. In electrically excited COIL lasers, (eCOIL), O2(1Delta) is produced in a plasma followed by injection of I2 in the afterglow containing the excited oxygen. The flowing afterglow additionally contains atomic O from dissociation of O2 in the plasma. The O atoms lead to dissociation of I2 and quenching of excited states, particularly the upper laser level, I*. While O atom helps in dissociating I2 thereby reducing the amount of O2(1Delta) required to achieve positive gain, it is also a quencher of I*, so managing the amount of O in the afterglow is necessary to maximize the laser gain. Additives such as NO and NO2 are effective in managing the O atom density and I inventory. These species consume O and I atoms by cyclic reactions involving O, NO, NO2, I2 and IO. In this paper, we report on results from a computational investigation of radiofrequency (rf) discharges and their flowing afterglows in He/O2 mixtures with NO and NO2 additives. The investigations were conducted with plug flow and 2-dimensional models. Scaling of O, O2(1Delta) and I* densities, and laser gain, while varying the mole fractions of NO injected through the discharge, and NO and NO2 injected downstream will be discussed reported. We found that moderate amounts of NO flowed through the discharge (< 10-20%) did not significantly change the discharge kinetics but did reduce the amount of O, and hence O3, downstream. The proper amount of NO and NO2 injection can maximize the gain even though O2(1Delta) densi- - ties may be lower for those cases due to consumption of ground state I and reducing the amount of O2(1Delta) required for I2 dissociation. The consequences of power and mole fractions on the production of I*, and system sensitivity to the rates of some important reactions, will also be discussed.

Published in:

Plasma Science, 2007. ICOPS 2007. IEEE 34th International Conference on

Date of Conference:

17-22 June 2007

Need Help?


IEEE Advancing Technology for Humanity About IEEE Xplore | Contact | Help | Terms of Use | Nondiscrimination Policy | Site Map | Privacy & Opting Out of Cookies

A not-for-profit organization, IEEE is the world's largest professional association for the advancement of technology.
© Copyright 2014 IEEE - All rights reserved. Use of this web site signifies your agreement to the terms and conditions.