Browsing by Author "Wang, F."

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Citation Count: Wang, F...et al. (2010). Average intensity and spreading of partially coherent standard and elegant Laguerre-Gaussian beams in turbulent atmosphere. Progress In Electromagnetics Research-Pier, 103, 33-56.
Average intensity and spreading of partially coherent standard and elegant Laguerre-Gaussian beams in turbulent atmosphere
(E M W Publishing, 2010) Wang, F.; Cai, Yangjian; Eyyuboğlu, Halil T.; Baykal, Yahya; 7688; 7812
Analytical expressions for the average intensity, mean-squared beam width and angular spread of partially coherent standard and elegant Laguerre-Gaussian (LG) beams propagating in turbulent atmosphere are derived. The properties of the average intensity, spreading and directionality of partially coherent standard and elegant LG beams in turbulent atmosphere are studied numerically and comparatively. It is found that the beam parameters and structure constant of turbulence together determine the properties of the beams in turbulent atmosphere. Partially coherent standard and elegant LG beams with smaller coherence length, larger beam orders and longer wavelength are less affected by the turbulence. A partially coherent elegant LG beam is less affected by turbulence than a partially coherent standard LG beam under the same condition. Furthermore, it is found that there exist equivalent partially coherent standard and elegant LG beams, equivalent fully coherent standard and elegant LG beams, equivalent Gaussian Schell-model beams that may have the same directionality as a fully coherent Gaussian beam both in free space and in turbulent atmosphere. Our results will be useful in long distance free-space optical communications
Citation Count: Wang, F...et al. (2011). Partially coherent elegant Hermite-Gaussian beam in turbulent atmosphere. Applied Physisc B-Lasers And Optics, 103(2), 461-469. http://dx.doi.org/10.1007/s00340-010-4219-z
Partially coherent elegant Hermite-Gaussian beam in turbulent atmosphere
(Springer, 2011) Wang, F.; Cai, Y.; Eyyuboğlu, Halil T.; Baykal, Yahya; 7688; 7812
Based on the extended Huygens-Fresnel integral, analytical formulas for the cross-spectral density, mean-squared beam width and angular spread of a partially coherent elegant Hermite-Gaussian (HG) beam in turbulent atmosphere are derived. The evolution properties of the average intensity, spreading and directionality of a partially coherent elegant HG beam in turbulent atmosphere are studied numerically. It is found that the partially coherent elegant HG beam with smaller initial coherence width, larger beam order and longer wavelength is less affected by the atmospheric turbulence. Compared to the partially coherent standard HG beam, the partially coherent elegant HG beam is less affected by turbulence under the same condition. Furthermore, it is found that there exist equivalent partially coherent standard and elegant HG beams, equivalent fully coherent standard and elegant HG beams, and an equivalent Gaussian-Schell-model beam may have the same directionality as a fully coherent Gaussian beam whether in free space or in turbulent atmosphere. Our results can be utilized in short and long atmospheric optical communication systems
Citation Count: Wang, F...et al. (2010). Partially coherent elegant Hermite-Gaussian beams. Applied Physisc B-Lasers And Optics, 100(3), 617-626. http://dx.doi.org/ 10.1007/s00340-010-3938-5
Partially coherent elegant Hermite-Gaussian beams
(Springer, 2010) Wang, F.; Cai, Yangjian; Eyyuboğlu, Halil T.; Baykal, Yahya; Çil, Celal Zaim; 7688; 7812
Elegant Hermite-Gaussian beams (EHGBs) are extended to the partially coherent case. An explicit and analytical formula is derived for the cross-spectral density of a partially coherent EHGB propagating through an aligned or misaligned paraxial ABCD optical system. The propagation properties of a partially coherent EHGB in free space and its focusing properties through a thin lens are studied numerically, and are compared to those of a partially coherent standard Hermite-Gaussian beam (SHGB). It is found that the propagation and focusing properties of a partially coherent EHGB are closely related to its initial coherence. A partially coherent EHGB spreads slower than a partially coherent SHGB in free-space propagation. A partially coherent EHGB can be focused more tightly than a partially coherent SHGB