Numerical simulation of steady-state thermal blooming about high power laser
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Department of Optics & Electron Engineering, Ordnance Engineering College, Shijiazhuang 050003, China;
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State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments and Mechanology, Tsinghua University, Beijing 100084, China
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Corresponding author:
NIU Yan-xiong, niuyanxiong@263.net
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Received Date:
2006-01-17
Accepted Date:
2006-04-20
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Abstract
When high power laser transmits in the atmosphere,thermal blooming will be generated.In order to study the phenomenon,the effect parameters to steady-state thermal blooming without wind are solved in detail by numerical simulation.It is studied that both epaxial light intensity and energy distribution at far field are affected by steady-state thermal blooming without wind.The study results indicate that as emission power increases,the peak power density on the section of a certain distance will increase firstly,then it will descend and that the peak light intensity on the section will increase with the increasing of spot radius of basic mode Gaussian beam.As the propagation distance increases,the peak light intensity on the section will descend gradually,and the laser energy will spread.The light intensity distribution exhibits straw hat shape on a certain conditions,in other word to say,the central light intensity is less than acroteric light intensity.The results is helpful to the research of high power laser's irradiation effect at far field.
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References
|
[1]
|
SU Y,WANG M.High energy laser system[M].Beijing:National Defence Industry Press,2004.143～144(in Chinese). |
|
[2]
|
GEBHARDT F G.Twenty-five years of thermal blooming:an overview[J].SPIE,1990,1221:2～25. |
|
[3]
|
WANG M,SU Y.Computation and analysis on focus shift of laser caused by atmospheric thermal blooming[J].Calculation Physics,2002,19(5):449～452(in Chinese). |
|
[4]
|
ZHENG Zh,LIU Y X,LÜ B D.Propagation properties of Hermite-Laguerre-Gaussian beam[J].Laser Technology,2005,29(6):641～644(in Chinese). |
|
[5]
|
QIANG X W.Analytical investigation on nonlinear thermal distortion effect of laser beams propagation in the atmosphere[J].Infrared and and Laser Engineering,2000,29(6):6～10(in Chinese). |
|
[6]
|
LIU J,LIU Sh F,JIN G.Thermal effects on laser propagating in a closed tube with air[J].Journal of Optoelectronics · Laser,2004,15(1):100～103(in Chinese). |
|
[7]
|
LI Zh G,WANG Sh B,GUO D H et al.Experimental study of guiding and triggering of air discharges by laser-induced plasma[J].Laser Technology,1999,23(6):332～334(in Chinese). |
|
[8]
|
TAO X Y,JI X L,LÜ B D.Numerical simulation of the thermal effect in a beam control system[J].Laser Technology,2003,27(6):514～516,596(in Chinese). |
|
[9]
|
GE Z M,LÜ Zh W,LIN D Y.The research and development of the stimulated Brillouin scattering in the optical component[J].Laser Technology,2002,26(5):375～378(in Chinese). |
|
[10]
|
LÜ B D.Propagation and control of high-power lasers[M].Beijing:National Defence Industry Press,1999.254～259(in Chinese). |
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