反射式单级衍射光栅

Reflection type single-order diffraction grating

介绍了单级衍射光栅的发展趋势,从理论上论证了单级衍射光栅的可行性,引入了一种新型衍射光学元件——准正弦反射式单级衍射光栅(QSRG).它能有效抑制高级衍射,可用于提高光谱系统的信噪比和精度.而通过QSRG的实验结果也验证了此新型色散元件确实具有良好的单级衍射特性,二级及以上的高级衍射被有效地抑制,与理论预测几乎一致.本文的结果可望在反射式光谱测量系统中得到广泛应用.

The development trend of single-order diffraction grating is introduced.The feasibility of single-order diffraction grating is theoretically demonstrated,and a novel diffractive optical element named quasi-sinusoidal reflection type single-order diffraction grating （QSRG） is proposed.It can suppress higher order diffraction,and improve the signal-noise-ratio（SNR） and accuracy.The experimental results verify this new type of dispersion component,where the higher order diffraction components are efficiently suppressed, which accords well with theoretical prediction.These results are expected to be widely used in the reflection spectrum measurement system.