Simulation of the ultraviolet pre-ionization in the mixture gas of non-chain HF laser

LUO Cong-; LI Dian-Jun-; ZHANG Lai-Ming-; XIE Ji-Jiang-; JIANG Ke-

The change of the distribution of electron density caused by photo-ionization when hv=5 eV and hv=10 eV was studied to identify the effect of ultraviolet pre-ionization on the main discharge. Firstly, the essential processes in the mixture gas under radiation of ultraviolet was introduced. Then a simple model was established. With the model, the distributions of electron density after the radiation of ultraviolet(hv=5 eV and hv=10 eV) were obtained. The results are as follows: the effective interaction lengths on hv=5 eV and hv=10 eV are 0.15 cm and 0.5 cm respectively under the condition of P=50 kPa and I=103 W/cm2. When the light intensity is increased to 106 W/cm2, the effective interaction lengths increase only to 0.3 cm and 0.8 cm respectively, which cant affect the main discharge effectively; when P=10 kPa, the effective interaction lengths are 1.1 cm and 2.7 cm, exerting large effect on the main discharge. According to the results, the conclusions is as follows: the ultraviolet with both 5 eV and 10 eV photon energy can affect the discharge effectively when P=10 kPa, and the pre-ionization could be more effective if the atmospheric pressure is lower.

1. State Key Laboratory of Laser Interaction with Matter,Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;

2. Graduate University of Chinese Academy of Sciences,Beijing 100049,China

Publish Date: 2012-08-25

Key words:

Abstract: The change of the distribution of electron density caused by photo-ionization when hv=5 eV and hv=10 eV was studied to identify the effect of ultraviolet pre-ionization on the main discharge. Firstly, the essential processes in the mixture gas under radiation of ultraviolet was introduced. Then a simple model was established. With the model, the distributions of electron density after the radiation of ultraviolet(hv=5 eV and hv=10 eV) were obtained. The results are as follows: the effective interaction lengths on hv=5 eV and hv=10 eV are 0.15 cm and 0.5 cm respectively under the condition of P=50 kPa and I=103 W/cm2. When the light intensity is increased to 106 W/cm2, the effective interaction lengths increase only to 0.3 cm and 0.8 cm respectively, which cant affect the main discharge effectively; when P=10 kPa, the effective interaction lengths are 1.1 cm and 2.7 cm, exerting large effect on the main discharge. According to the results, the conclusions is as follows: the ultraviolet with both 5 eV and 10 eV photon energy can affect the discharge effectively when P=10 kPa, and the pre-ionization could be more effective if the atmospheric pressure is lower.

HTML

Reference (16)

[1]	易明, 王晓, 王龙. 美军光电对抗技术、装备现状与发展趋势初探[J]. 红外与激光工程, 2006, 35(5): 601-607.
[2]	Yi Ming, Wang Xiao, Wang Long. Status quo and trend of American army of electro-optic countermeasure technology and equipment[J]. Infrared and Laser Engineering, 2006, 35(5): 601-607. (in Chinese)
[3]	Apollonov V V, Firsov K N, Kazantsev S Y, et al. Scaling up of nonchain HF (DF) laser initiated by self-sustained volume discharge [C]//SPIE, 2000, 3886: 370.
[4]	易爱平, 刘晶儒. 电激励重复频率非链式HF激光器[J]. 光学精密工程, 2011, 19(2): 360-366.
[5]	王文斗, 王刚华. SF6气体间隙开关激光触发延迟的数值模拟[J]. 强激光与粒子束, 2006, 18(4): 657-662.
[6]	Bulaev V D, Gusev V S, Kazantsev S Y, et al. High-power repetitively pulsed electric-discharge HF laser [J]. Quantum Electron, 2010, 40: 615.
[7]	Mabru M, Vannier C, Brunet H． Improved DF performance of a repetitively pulsed HF/DF laser using a deuterated compound [C]//SPIE, 1997, 3092: 494.
[8]	Mabru M, Voighier F, Brunet H. High energy-high average power pulsed HF/DF chemical laser[C]//SPIE, 1995, 2502: 388.
[9]	Lacour B, Pasquiers S, Postel C, et al. Importance of pre-ionisation for the non-chain discharge-pumped HF laser[J]. Appl Phys B, 2001, 72: 289-299.
[10]	Yi Aiping, Liu Jingru. Electrically initiated repetitive-pulsed non-chain HF lasers[J]. Optics and Precision Engineering, 2011, 19(2): 360-366. (in Chinese)
[11]	Belevtsev A A, Firsov K N. UV-preionization in non-chain HF lasers with a self-sustainde volume discharge to initate chemical reaction-is it really essential？[C]//SPIE, 2003, 5120: 557-563.
[12]	Lacour B. High average power HF/DF Lasers[C]//SPIE, 2000, 4071: 9-15.
[13]	Cook G R, Metzger P H. Photoionization and absorption cross sections of H2 and D2 in the vacuum ultraviolet region[J]. Journal of The Optical Society of America, 1964, 54 (8): 968-972.
[14]	Yan M, Sadeghpour H R, Dalgarno A. Photoionization cross sections of He and H2[J]. The Astrophysi Journal, 1998, 496: 1044-1050.
[15]	Wang Wendou, Wang Ganghua. Number simulation of laser triggered SF6 gap switch delay modeling[J]. High Power Laser and Particle Beams, 2006, 18(4): 657-662. (in Chinese)
[16]	Morrow R. A survey of the electron and ion transport properties of SF6 [J]. IEEE Transaction on Plasma Science, 1986, PS-14(3): 234-239.

Simulation of the ultraviolet pre-ionization in the mixture gas of non-chain HF laser

Abstract

References

Proportional views

通讯作者: 陈斌, bchen63@163.com

Article Metrics

Related

Proportional views