Experimental determination of the diffraction angle of volume holographic gratings under off 體全息光柵偏移布拉格角讀出時(shí)衍射角的測(cè)定
The blue wavelengths are diffracted at a lesser angle than the green wavelengths , which are at a lesser angle than the red wavelengths 藍(lán)色波長(zhǎng)的衍射角度要小于綠色波長(zhǎng)的衍射角,它們均比紅色光的衍射角度小。
The basis is that when incident polarized light gets through a liquid - crystal box , it ’ s first diffraction angle and optical intensity are controlled by periodic electric field 其原理為:入射偏振光通過(guò)空間周期電場(chǎng)作用下的液晶盒,一級(jí)衍射角和衍射光強(qiáng)受到電壓的調(diào)制。
Numerical examples show that , pulse deformation and broadening , spectrum redshifting , narrowing and distortion take place with increasing diffraction angle in the near field , and the pulse form changes with propagation distance in the near field , but is preserved in the far field 數(shù)值計(jì)算例說(shuō)明在近場(chǎng)隨衍射角的增大會(huì)出現(xiàn)脈沖變形、加寬、譜紅移、變形、變窄等特性,脈沖形狀在近場(chǎng)隨傳輸距離變化而變化,但在遠(yuǎn)場(chǎng)保持不變。