Journal of Optoelectronics · Laser, Volume. 34, Issue 12, 1321(2023)
Spectral shifts and spectral switches of partially coherent radially polarized Laguerre-Gaussian pulsed beams propagating through atmosphere turbulence
The spectral shifts and spectral switches of partially coherent radially polarized Laguerre-Gaussian (PCRPLG) pulsed beams propagating through atmospheric turbulence are investigated.It is found that the on-axis spectrum of the beams will shift rapidly in atmospheric turbulence due to the appearance of two spectral peaks caused by the turbulence.The stronger the turbulence is,the more stable the relative spectral shifts are after the rapid shift, and the off-axis spectrum has a smaller variation range of relative spectral shifts in stronger turbulence.It is also found that the influence of atmospheric turbulence on the spectral shifts of the on-axis and off-axis spectra can be significantly reduced by appropriately increasing the pulse width.Under different pulse widths,spectral switches appear in both on-axis and off-axis spectra,and the off-axis spectrum will produce a unique phenomenon of two rapid shifts.For a fixed transmission distance,the higher the topological charges are,the smaller the spectral shift of the on-axis spectrum is,and the smaller the variation range of the relative spectral shifts in the paraxial region is.In addition,spectral switches will appear in different topological charges.The larger the coherent length is,the more stable the spectral shifts are, and the farther the spectral switch occurs in the off-axis spectrum.The results of this paper provide a theoretical basis for the application of Doppler lidar.The PCRPLG pulsed beam itself has a strong anti-turbulence ability, and the spectral shifts of the beams can be reduced by adjusting the beam parameters.
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AN Bangzhuo, XU Yonggen, XU Qian. Spectral shifts and spectral switches of partially coherent radially polarized Laguerre-Gaussian pulsed beams propagating through atmosphere turbulence[J]. Journal of Optoelectronics · Laser, 2023, 34(12): 1321
Received: Jan. 24, 2023
Accepted: --
Published Online: Sep. 25, 2024
The Author Email: XU Yonggen (xuyonggen06@126.com)