Far-field intensity and diffraction efficiency of the blazed reflection gratings illuminated with broad-bandwidth and divergent beam are investigated.When the spectral width and divergence of the incident beam with a ...Far-field intensity and diffraction efficiency of the blazed reflection gratings illuminated with broad-bandwidth and divergent beam are investigated.When the spectral width and divergence of the incident beam with a constant energy increase,the maximum intensity decreases,and the half width at e-2 of the maximum intensity becomes wider.Diffraction efficiency has no deterioration for the blazed grating with a proper groove shape even when the incident light contains a broad range of wavelengths and comes from a wide range of angles.展开更多
In this paper, a binary blazed grating-based polarization independent filter on silicon on insulator （SOI） under full conical incidence is presented. The properties of the grating filter are investigated by rigorous...In this paper, a binary blazed grating-based polarization independent filter on silicon on insulator （SOI） under full conical incidence is presented. The properties of the grating filter are investigated by rigorous coupled-wave analysis. It＇s shown that the filter demonstrates high reflectivity （R 〉 99%） at its resonant wavelength, which stays the same under three different polarization states. It indicates that this grating filter is polarization-independent. The final data shows its polarization-dependent loss （PDL） is only 0.04 dB and the full width at half maximums （FWHMs） of the transverse electric （TE-） and transverse magnetic （TM-） polarized light are 0.24 and 0.46nm, respectively.展开更多
Single-point diamond turning (SPDT) is widely used in the machining of infrared materials and metal-based mirrors. Diamond tips can scratch material, replicate the shape of the tip, and create annular turning marks on...Single-point diamond turning (SPDT) is widely used in the machining of infrared materials and metal-based mirrors. Diamond tips can scratch material, replicate the shape of the tip, and create annular turning marks on optical surfaces, which can have unpredictable adverse effects on imaging. In order to predict the effect of turning marks diffraction on the degradation of imaging quality, a model of the influence of SPDT processing parameters on the reduction of system imaging MTF under the influence of ideal grating turning marks diffraction was established. The results show that the depth of the turning mark will lead to the decline of MTF, especially the low frequency information. Finally, a method is proposed to reduce the effect of turning marks diffraction through changing the processing parameters. .展开更多
基金Key Technologies R&D Programme of Hubei Province(2005AA101B10)
文摘Far-field intensity and diffraction efficiency of the blazed reflection gratings illuminated with broad-bandwidth and divergent beam are investigated.When the spectral width and divergence of the incident beam with a constant energy increase,the maximum intensity decreases,and the half width at e-2 of the maximum intensity becomes wider.Diffraction efficiency has no deterioration for the blazed grating with a proper groove shape even when the incident light contains a broad range of wavelengths and comes from a wide range of angles.
基金Acknowledgements This work was partially supported by the National Natural Science Foundation of China （Grant No. 61177058）, and the National High Technology Research and Development Program of China （No. 2011AA010302）.
文摘In this paper, a binary blazed grating-based polarization independent filter on silicon on insulator （SOI） under full conical incidence is presented. The properties of the grating filter are investigated by rigorous coupled-wave analysis. It＇s shown that the filter demonstrates high reflectivity （R 〉 99%） at its resonant wavelength, which stays the same under three different polarization states. It indicates that this grating filter is polarization-independent. The final data shows its polarization-dependent loss （PDL） is only 0.04 dB and the full width at half maximums （FWHMs） of the transverse electric （TE-） and transverse magnetic （TM-） polarized light are 0.24 and 0.46nm, respectively.
文摘Single-point diamond turning (SPDT) is widely used in the machining of infrared materials and metal-based mirrors. Diamond tips can scratch material, replicate the shape of the tip, and create annular turning marks on optical surfaces, which can have unpredictable adverse effects on imaging. In order to predict the effect of turning marks diffraction on the degradation of imaging quality, a model of the influence of SPDT processing parameters on the reduction of system imaging MTF under the influence of ideal grating turning marks diffraction was established. The results show that the depth of the turning mark will lead to the decline of MTF, especially the low frequency information. Finally, a method is proposed to reduce the effect of turning marks diffraction through changing the processing parameters. .
