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

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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 CO V0012 and N *Vib2 can be obtained, which is important to get higher excitation efficiency for the upper laser level.

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Authors and Affiliations

  1. School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, China

    Heng Zhao, Bo Li, Wenjin Wang, Yi Hu & Youqing Wang

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  1. Heng Zhao
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  2. Bo Li
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  3. Wenjin Wang
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  4. Yi Hu
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  5. Youqing Wang
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Corresponding author

Correspondence to Youqing Wang.

Additional information

Heng Zhao is a Ph.D. candidate in the School of Optical and Electronic Information of Huazhong University of Science and Technology in Wuhan, Hubei, China. He received his B.S. degree from Huazhong University of Science and Technology. His current research interests include high power gas laser, integration of high power laser processing system and radio frequency (RF) power amplifier.

Bo Li obtained his B.S., M.S. and Ph.D. degrees from Huazhong University of Science and Technology in 2000, 2003 and 2010, respectively. Currently, he is a lecturer of the School of Optical and Electronic Information of Huazhong University of Science and Technology. His research fields are: high-power lasers and laser processing.

Wenjin Wang is a Ph.D. candidate in the School of Optical and Electronic Information of Huazhong University of Science and Technology in Wuhan, Hubei, China. His interests include research on a high-power CO2 laser system design and optimization, gas discharge stability, and the kinetic modeling.

Yi Hu is a Ph.D. candidate in the School of Optical and Electronic Information of Huazhong University of Science and Technology in Wuhan, Hubei, China. She received her B.S. degree from Huazhong university of Science and Technology. Her current research focuses on laser physics, laser optics, and high power laser industrial application.

Youqing Wang is a Professor and doctoral advisor, who has long been engaged in basic research on a high-power CO2 laser and applied research on laser processing material. Wang is with the College of Optoelectronic Science and Technology, Huazhong University of Science and Technology, Wuhan, China.

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Zhao, H., Li, B., Wang, W. et al. Effect of excitation frequency on characteristics of mixture discharge in fast-axial-flow radio frequency-excited carbon dioxide laser. Front. Optoelectron. 9, 592–598 (2016). https://doi.org/10.1007/s12200-015-0523-x

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  • DOI: https://doi.org/10.1007/s12200-015-0523-x

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