arXiv physics/06061932006-06-22physics.optics

弱大气turbulence中两束不同波长高斯laser光束的闪烁指数

Scintillation index for two Gaussian laser beams with different wavelengths in weak atmospheric turbulence

Avner Peleg, Jerome V. Moloney

备注：: 26 pages, 7 figures. Submitted to J. Opt. Soc. Am. A
DOI：: 10.1364/JOSAA.23.003114

摘要：

研究了两束不同波长的最低阶高斯光束在弱湍流大气中的传输。使用Rytov近似，并假设一个缓慢的探测器，我们计算了一个典型的自由空间激光通信设置的闪烁指数的纵向和径向分量。我们找到了两束激光相对于纵向闪烁指数的最佳配置。我们表明，最佳的两束配置的纵向闪烁的值是小于50%以上的值相比，一个单一的最低阶高斯光束具有相同的总功率。此外，最佳双光束系统的径向闪烁比单光束情况下的径向闪烁小35%-40%。通过分析自身和交叉强度对闪烁指数的贡献，进一步了解了强度波动的减少。

英文摘要：

We study propagation of two lowest order Gaussian laser beams with different wavelengths in weak atmospheric turbulence. Using the Rytov approximation and assuming a slow detector we calculate the longitudinal and radial components of the scintillation index for a typical free space laser communication setup. We find the optimal configuration of the two laser beams with respect to the longitudinal scintillation index. We show that the value of the longitudinal scintillation for the optimal two-beam configuration is smaller by more than 50% compared with the value for a single lowest order Gaussian beam with the same total power. Furthermore, the radial scintillation for the optimal two-beam system is smaller by 35%-40% compared with the radial scintillation in the single beam case. Further insight into the reduction of intensity fluctuations is gained by analyzing the self- and cross-intensity contributions to the scintillation index.

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摘要：

英文摘要：

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