To suppress the higher order harmonics in monochromatic light come from a synchrotron radiation source and to improve the polarization characteristics of the source in a long wavelength, this paper analyzes the polarization characteristics of an triple-reflector polarizer Au_Si_Au and discusses its suppress abilities for higher order harmonics based on the concept of triple-reflection polarizer. It compares the characteristics of Au_Si_Au, Au_SiC_Au and Au_Be_Au triple-reflector polarizers for suppression to higher order harmonics and improvement on polarization characteristics. Obtained results show that the triple-reflector polarizer Au_Si_Au can suppress the higher order harmonics more effectively than other polarizers. Furthermore, After the light is reflected by the polarizer, the reflectance of the P component almost can be zero and that of the S component can totally blocked in the photo energy down to 30 eV. Moreover, the polarization of the source has been improved up to 99%in wavelength of 20 eV.%为了抑制同步辐射光通过光栅单色器后出射的单色光在长波段的高次谐波以及提高光源在该波段的偏振特性,计算分析了三镜偏振器Au_Si_Au的偏振特性及其对长波段高次谐波的抑制效果.比较了Au-Si_Au,Au_SiC_Au和Au_Be_Au 3种不同材料的偏振镜抑制高次谐波的能力和对偏振度的提高.计算分析表明,Au_Si_Au三镜组合镜对长波段的高次谐波抑制效果较好,光源通过Au_Si_Au三镜反射后,P分量的反射率几乎为0,而S分量在30 eV以后几乎全被抑制.Au_Si_Au三反射镜不仅可以抑制30 eV以上的高次谐波,而且使该波段光源的偏振性得到提高,20 eV时最高偏振度可达99％以上,从而在极大地改善同步辐射光源纯度的同时提高了光源的偏振度.
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