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Title: Plasma chemistry of the sealed-off slab CO laser active medium pumped by radio-frequency discharge with liquid-nitrogen-cooled electrodes

Abstract

The long-term time behavior of the output power of a sealed-off cryogenic slab CO laser pumped by a repetitively pulsed RF discharge and operating on the overtone (λ = 2.6–3.5 μm) vibrational−rotational transitions of the CO molecule was studied experimentally. It is shown that adding of an anomalously large amount of oxygen (up to 50% with respect to the CO concentration) to the initial gas mixture CO : He = 1 : 10 leads to a manyfold (by several tens of times) increase in the duration of the laser operating cycle (until lasing failure due to the degradation of the active medium). In this case, the laser life-time without replacement of the active medium reaches 10{sup 5}–10{sup 6} pulses. Using various diagnostics (including luminescence spectroscopy and IR and UV absorption spectroscopy), regularities in the time-behavior of the concentrations of the main component of the active medium (CO molecules) and the products of plasmachemical reactions (O{sub 3}, CO{sub 2}) generated in the discharge gap during the laser operating cycle are revealed. Time correlation between the characteristics of the active medium and the laser output power are analyzed. A phenomenological approach to describing the entirety of plasmachemical, purely chemical, gas-dynamic, and diffusionmore » processes determining the behavior of the laser output characteristics throughout the laser operating cycle is offered.« less

Authors:
; ; ;  [1]
  1. Russian Academy of Sciences, Lebedev Physical Institute (Russian Federation)
Publication Date:
OSTI Identifier:
22760306
Resource Type:
Journal Article
Journal Name:
Plasma Physics Reports
Additional Journal Information:
Journal Volume: 43; Journal Issue: 9; Other Information: Copyright (c) 2017 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-780X
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ABSORPTION SPECTROSCOPY; CARBON DIOXIDE; CARBON MONOXIDE; CRYOGENICS; ELECTRODES; LASERS; MOLECULES; OZONE; RADIOWAVE RADIATION; SLABS; PLASMA CHEMISTRY

Citation Formats

Ionin, A. A., E-mail: aion@sci.lebedev.ru, Kozlov, A. Yu., Seleznev, L. V., and Sinitsyn, D. V., E-mail: dsinit@sci.lebedev.ru. Plasma chemistry of the sealed-off slab CO laser active medium pumped by radio-frequency discharge with liquid-nitrogen-cooled electrodes. United States: N. p., 2017. Web. doi:10.1134/S1063780X17090033.
Ionin, A. A., E-mail: aion@sci.lebedev.ru, Kozlov, A. Yu., Seleznev, L. V., & Sinitsyn, D. V., E-mail: dsinit@sci.lebedev.ru. Plasma chemistry of the sealed-off slab CO laser active medium pumped by radio-frequency discharge with liquid-nitrogen-cooled electrodes. United States. doi:10.1134/S1063780X17090033.
Ionin, A. A., E-mail: aion@sci.lebedev.ru, Kozlov, A. Yu., Seleznev, L. V., and Sinitsyn, D. V., E-mail: dsinit@sci.lebedev.ru. Fri . "Plasma chemistry of the sealed-off slab CO laser active medium pumped by radio-frequency discharge with liquid-nitrogen-cooled electrodes". United States. doi:10.1134/S1063780X17090033.
@article{osti_22760306,
title = {Plasma chemistry of the sealed-off slab CO laser active medium pumped by radio-frequency discharge with liquid-nitrogen-cooled electrodes},
author = {Ionin, A. A., E-mail: aion@sci.lebedev.ru and Kozlov, A. Yu. and Seleznev, L. V. and Sinitsyn, D. V., E-mail: dsinit@sci.lebedev.ru},
abstractNote = {The long-term time behavior of the output power of a sealed-off cryogenic slab CO laser pumped by a repetitively pulsed RF discharge and operating on the overtone (λ = 2.6–3.5 μm) vibrational−rotational transitions of the CO molecule was studied experimentally. It is shown that adding of an anomalously large amount of oxygen (up to 50% with respect to the CO concentration) to the initial gas mixture CO : He = 1 : 10 leads to a manyfold (by several tens of times) increase in the duration of the laser operating cycle (until lasing failure due to the degradation of the active medium). In this case, the laser life-time without replacement of the active medium reaches 10{sup 5}–10{sup 6} pulses. Using various diagnostics (including luminescence spectroscopy and IR and UV absorption spectroscopy), regularities in the time-behavior of the concentrations of the main component of the active medium (CO molecules) and the products of plasmachemical reactions (O{sub 3}, CO{sub 2}) generated in the discharge gap during the laser operating cycle are revealed. Time correlation between the characteristics of the active medium and the laser output power are analyzed. A phenomenological approach to describing the entirety of plasmachemical, purely chemical, gas-dynamic, and diffusion processes determining the behavior of the laser output characteristics throughout the laser operating cycle is offered.},
doi = {10.1134/S1063780X17090033},
journal = {Plasma Physics Reports},
issn = {1063-780X},
number = 9,
volume = 43,
place = {United States},
year = {2017},
month = {9}
}