Effect of excitation frequency on characteristics of mixture discharge in fast-axial-flow radio frequency-excited carbon dioxide laser

doi:10.1007/s12200-015-0523-x

Front. Optoelectron.

2016, Vol. 9

Issue (4) : 592-598 https://doi.org/10.1007/s12200-015-0523-x

RESEARCH ARTICLE

Effect of excitation frequency on characteristics of mixture discharge in fast-axial-flow radio frequency-excited carbon dioxide laser

Heng ZHAO,Bo LI,Wenjin WANG,Yi HU,Youqin WANG(

)

School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, china

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Abstract

A one-dimensional fluid model has been used to describe the effect of radio frequency (RF) on the characteristics of carbon dioxide (CO₂), nitrogen (N₂) and helium (He) mixture discharge at 120 mbar in fast-axial-flow RF-excited CO₂ laser. A finite difference method was applied to solve the one-dimensional fluid model. The simulation results show that the spatial distributions of electron density and current density rely strongly on the modulating driven frequency. When the excitation frequency changes from 5 to 45 MHz, the plasma discharge is always in $α$ mode. Moreover, as the excitation frequency increasing, the higher densities of $C O 2 V 001$ and $N 2 * V i b$ can be obtained, which is important to get higher excitation efficiency for the upper laser level.

Keywords plasma numerical simulation CO₂/He/N₂ mixture discharges one-dimensional fluid model

Corresponding Author(s): Youqin WANG

Just Accepted Date: 17 August 2015 Online First Date: 11 September 2015 Issue Date: 29 November 2016

Cite this article:

Heng ZHAO,Bo LI,Wenjin WANG, et al. Effect of excitation frequency on characteristics of mixture discharge in fast-axial-flow radio frequency-excited carbon dioxide laser[J]. Front. Optoelectron., 2016, 9(4): 592-598.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-015-0523-x
https://academic.hep.com.cn/foe/EN/Y2016/V9/I4/592

Fig.1 Geometry of discharge system

No.	process	notation
1	excitation of the bending mode (010) in CO₂	e+ CO₂—>e+ $C O 2 V 010$
2	excitation of the lower laser level (020+ 100) in CO₂	e+ CO₂—>e+ $C O 2 V 020 + 100$
3	excitation of the asymmetric stretching mode (001) in CO₂	e+ CO₂—>e+ $C O 2 V 001$
4	electronic excitation of CO₂	e+ CO₂—>e+ $C O 2 *$
5	dissociative attachment in CO₂	e+ CO₂—>CO+ O⁻
6	ionization of CO₂	e+ CO₂—>2e+ $C O 2 +$
7	elastic collisions of He with electrons	e+ He—>e+ He
8	electronic excitation of He	e+ He—>e+ He*
9	ionization of He	e+ He—>2e+ He⁻
10	elastic collisions of N₂ with electrons	e+ N₂—>e+ N₂
11	ionization of N₂	e+ N₂—>2e+ $N 2 +$
12	excitation of vibration mode in N₂	e+ N₂—>e+ $N 2 * V i b$
13	excitation of rotation mode in N₂	e+ N₂—>e+ $N 2 * R o t$

Tab.1 Collision reactions in the simulation

Fig.2 Electron density versus excitation frequency in spatial profiles

Fig.3 Current amplitude versus excitation frequency

Fig.4 Electron production rate versus excitation frequency in spatial profiles

Fig.5 Electric field versus excitation frequency in spatial profiles

Fig.6 Electron temperature versus excitation frequency in spatial profiles

Fig.7 Maximum density of main particles versus excitation frequency

Fig.8 Excitation efficiency versus excitation frequency in spatial profiles

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