研究表明干涉场中的相位鞍点以及涡旋点的位置与光束的离轴参数、束腰宽度、相位以及相对振幅有关。
It is shown that the positions of phase saddles and vortices depend on the off-axis parameter, beam width, phase and relative amplitude of beams.
相位变更（PD）方法是一种基于两个或多个不同离焦面图像来恢复光瞳畸变波前相位的光学波前传感技术。
Phase diversity(PD)is a kind of wavefront sensing technique based on the measurement of two or more object images.
并从理论上证明了该方法的相位测量精度不受散离噪声极限的限制。
It has been theoretically demonstrated that the sensitivity of measurement can be beyond the shot -noise limit.
模拟研究结果表明，相位差法可以较准确的恢复出波前相位，并且最优化的离焦波面差为一个波长。
Simulation results show phase-diversity method can accurately retrieve the wavefront and defocusing of one wavelength is optimal.
模拟研究结果表明，相位差法可以较准确的恢复出波前相位，并且最优化的离焦波面差为一个波长。
Simulation results show phase-diversity method can accurately retrieve the wavefront and defocusing of one wavelength is optimal.
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