The phase of optical wave can be recovered by the intensity transport equation under the paraxial approximation For the optical system with diffraction limit, it is difficult to get the boundary radical slope of phase and sample in the circular domain boundary when using the intensity transport equation to recover the phase, consequently, we reviewed an algorithm mentioned in the reference ［4］, namely, the equation, computation domain and boundary condition are changed, then the phase is reconstructed by the multigrid method and corrected at last Moreover, the experiment system is set to testify the algorithm, and the recovered phase from the intensity data detected by CCD is compared with the result from phase retrieval algorithm, it is found that the phase reconstruction error can reach 017 λ in the case of non-uniform intensity distribution, as a result, the method is suitable for the phase recovery with low wavefront sensing accuracy.

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I am speaking under correction ....

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I'm speaking under correction .

我說(shuō)的不一定正確。

I speak under correction; for I am not a specialist.

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I speak under correction, for only the editors know how much were usable .

我所說(shuō)的不一定正確，因?yàn)橹挥芯庉嬛滥切┛捎谩?/p>

I say this under correction.

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Over and under correction are the result of the surgeon incorrectly estimating the concentration that needs to be applied during the surgery.

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Think that the message read on the back of a Ding Ding Yes, I think that's wrong, also made comments also under correction.

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He worketh under correction, and seeketh to rest: let his hands be idle, and he seeketh liberty.

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