Analysis of spectral propagating properties of Gaussian beam
-
Corresponding author:
SHEN Xue-ju, shxjoptics@yahoo.com.cn
;
-
Received Date:
2011-11-28
Accepted Date:
2011-12-19
-
Abstract
In order to analyze the spectral propagating properties of laser beam,spectral propagation equations of Gaussian beam propagating through free space and turbulent atmosphere were derived according to the extended Huygens-Fresnel formula,and then numerical simulation was carried out for the beam with center frequency 1.78×1015rad/s and bandwidth 8.39×1013rad/s.Results indicate that when Gaussian beam propagating through free space and turbulent atmosphere,spectrum blue-shifted exists at the scopes of near-axis and red-shifted happens if the distance from z-axis increases to a critical value.Turbulent atmosphere has the ability to reduce spectrum shift for off-axis scope,and increase of spectrum bandwidth in source can make spectrum shift phenomena more obvious.Intensity distribution vertical to z-axis at 5000m for Gaussian beams with frequency 1.78×1015rad/s and 1.75×1015rad/s shows that,for a fixed position light intensity of center frequency becomes weaker than intensity of some other frequency,and this can leads to spectral shift,besides,the phenomena of spectral changing with some parameters can be explained with the theories of Gaussian beam propagation and turbulent atmosphere beam width-spreading effect.
-
-
References
|
[1]
|
XING J B,XU G L,ZHANG X P,et al.Effect of the atmospheric turbulence on laser communication system[J].Acta Photonica Sinica,2005,34(12):1850-1852(in Chinese). |
|
[2]
|
JI X L,ZHANG T,CHEN X W,et al.Spectral properties of flattopped beams propagating through atmospheric turbulence[J].Acta Optica Sinica,2008,28(1):12-16(in Chinese). |
|
[3]
|
ZHAO Y J,WANG J A,REN X Ch,et al.Effect of the atmospheric turbulence on the bit error rate of laser communication among the ships[J].Laser Technology,2010,34(2):261-264(in Chinese). |
|
[4]
|
ZHAO Zh W,WU Zh S,SHEN G D,et al.Attenuation due to fog for 10.6μm wavelength[J].Journal of Infrared and Millimeter Waves,2002,21(2):95-98(in Chinese). |
|
[5]
|
RAO R Zh,WANG Sh P,LIU X Ch,et al.Experimental study of spot dancing of laser beam in a turbulent atmosphere[J].Chinese Journal of Lasers,2000,27(11):1011-1015(in Chinese). |
|
[6]
|
YANG A L,LI J H,LÜB D.A comparative study of the beam-width spreading and angular spread in atmospheric turbulence[J].Acta Physica Sinica,2009,58(4):2451-2459(in Chinese). |
|
[7]
|
QU J,YUAN Y Sh,MENG K,et al.Axial intensity distribution of limited Laguerre-Gaussian beams in turbulent atmosphere[J].Laser Technology,2010,34(1):141-144(in Chinese). |
|
[8]
|
XU G Y,WU J,YANG Ch P,et al.Simulation and optical scintillation research of Gaussian beam in atmosphere turbulence[J].Laser Technology,2008,32(5):548-550(in Chinese). |
|
[9]
|
JI X L,LÜB D.Effect of turbulence on the spectral shift of partially coherent light[J].Chinese Journal of Lasers,2005,32(4):506-510 (in Chinese). |
|
[10]
|
SHEN X J,WANG L,SHEN H B,et al.Propagation analysis of flattened circular Gaussian beams with a misaligned circular aperture in turbulent atmosphere[J].Optics Communications,2009,282 (24):4765-4770. |
|
[11]
|
ZHOU T Zh,DENG L G.Gaussian beam z-scan diffraction theory model for the strong nonlinear absorption materials[J].High Power Laser&Particle Beams,2004,16(6):721-725(in Chinese). |
|
[12]
|
WANG L L.Numerical calculate and simulation analyze oriented atmosphere laser communication system[D].Xi'an:Xi'an University of Technology,2006:18(in Chinese). |
|
[13]
|
DENG L G,LI Y L,SU W Y,et al.Effects of the medium location and the beam-waist radius on the operating performances of the refractive optical limiting devices[J].Chinese Journal of Quantum Electronics,2004,21(4):434-439(in Chinese). |
-
-
Proportional views
-
Map
DownLoad: