A new method for measuring grating groove density is proposed using multiple diffraction orders and one standard wavelength to eliminate the eccentricity effect originated from the rotation of a diffraction grating. Based on the Littman configuration for autocollimation, the groove density can be obtained by measuring the internal angles between the zeroth-order and two nonzeroth-order diffracted beams for one laser wavelength at a certain incident angle. The method was applied to measure the groove density of a plane grating with a nominal groove density of 651 lines/mm, where the mean value of this grating was measured to be 650.76 lines/mm with a relative measurement error Delta N/N of 3.8 x 10(-5). (c) 2018 Optical Society of America
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机译:使用多个衍射终端和一个标准波长提出了一种测量光栅密度的新方法,以消除源自衍射光栅的旋转的偏心效应。 基于用于自动胶凝的Littman配置,可以通过测量零阶阶数与一个激光波长以某种入射角的两个非销量衍射光束之间的内部角度来获得凹槽密度。 施加该方法以测量具有651线/ mm的标称槽密度的平面光栅的槽密度,其中该光栅的平均值为650.76线/ mm,相对测量误差Delta N / N为3.8 x 10(-5)。 (c)2018年光学学会
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