The position and period of grating fringes will vary against the substrate during double beam interference exposure due to temperature variation,air flow,vibration and other factors in the fabrication of large-size holographic gratings.It will result in the decrease of grating contrast.The dynamic change of fringes was analyzed during large-size grating exposure.The Root-Mean-Square(RMS)errors of fringe translation and period in 3 hours are 1.87 and 1.20 period respectively.The corresponding simulative grat...
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