信标光波长对全场补偿的影响
Effect of beacon wavelength on full field compensation
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摘要: 激光在近水平长距离传输时，闪烁效应会影响自适应光学的校正效果。在Rytov近似下，导出了纯相位补偿方差和全场补偿方差与信标光波长的关系，研究了信标光波长对补偿效果的影响。结果表明，当信标光的波长与主激光波长之比小于1.89时，全场补偿的方差小于纯相位补偿的方差。Abstract: Amplitude scintillation affects adaptive optics correction seriously when laser propagates long distances nearly horizontally in atmosphere. Field correction can be fulfilled with two-deformable-mirror adaptive optics. The result of correction is affected by the choice of beacon wavelength. Expressions of field variance and beacon wavelength for phase and field compensations are derived by Rytov approximation. The calculated results show that when the ratio of beacon wavelength to main laser wavelength is less than 1.89, field variance of full field compensation is less than that of phase compensation.
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Key words:
- turbulence /
- beacon wavelength /
- plase compensation /
- full field compensation /
- variance
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