A variable transmittance is provided to different position on grayscale mask plane and the required diffractive optical elements can be obtained after one-time exposure.
通过灰度掩模平面不同位置处提供可变的透过率，经一次光刻后得到所需的衍射光学元件。
Results show that extending the exposure time mitigate the extent of the atmospheric scintillation of uplink optical beam.
研究结果表明，随着曝光时间的增大，上行传输光束的闪烁强度显著降低；
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