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衍射角的測定
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:入射偏振光通過空間周期電場作用下的液晶盒,一級衍射角和衍射光強受到電壓的調制。
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 數值計算例說明在近場隨衍射角的增大會出現脈沖變形、加寬、譜紅移、變形、變窄等特性,脈沖形狀在近場隨傳輸距離變化而變化,但在遠場保持不變。