Fiber grating is manufactured by application of phase maskmeans, which is of low requirement of time coherence and monochromaticity for light-source, simple craft and high rate of finished products.
运用相位掩模法刻蚀光纤光栅，该方法对光源的时间相干性和单色性要求较低，工艺简单，成品率高。
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If we're using the wrong mask, that means we're either throwing out real data, which is bad, or we're keeping bad data, which is worse.