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JOURNALS // Kvantovaya Elektronika // Archive

Kvantovaya Elektronika, 2015 Volume 45, Number 10, Pages 973–978 (Mi qe16262)

This article is cited in 3 papers

Laser applications and other topics in quantum electronics

Study of spectral characteristics of radiation from a thermal wake of a pulsating optical discharge in a supersonic air flow

A. N. Malov, A. M. Orishich, Ya. S. Terent'eva

Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk

Abstract: The spectral characteristics of the thermal wake of a pulsating optical discharge (POD) in a supersonic air flow are studied. The POD is stimulated by radiation of a mechanically Q-switched, repetitively pulsed CO2 laser with a pulse repetition rate of 7 – 150 kHz and a power up to 4.5 kW. The flow is produced by means of the supersonic aerodynamic MAU-M setup having a conic nozzle with a critical cross-section size of 50 mm, the Mach number being 1.3 – 1.6. We describe in detail the system of optical diagnostics that allows the detection of the spectrum of the weak thermal wake glow against the background of high-power POD radiation. The glow of the thermal wake is due to the emission of light by atoms and ions of nitrogen and oxygen, carried by the flow in the form of hot low-density gas clouds (caverns). The wavelengths of the thermal wake emission and the data on the transitions, corresponding to the spectral lines are presented.

Keywords: pulsating optical discharge, thermal wake, cavern, supersonic air flow.

PACS: 42.55.Lt, 52.50.Jm

Received: 20.04.2015
Revised: 10.08.2015


 English version:
Quantum Electronics, 2015, 45:10, 973–978

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