光学精密工程
光學精密工程
광학정밀공정
OPTICS AND PRECISION ENGINEERING
2009年
10期
2506-2511
,共6页
轴棱锥%顶点加工精度%无衍射光束
軸稜錐%頂點加工精度%無衍射光束
축릉추%정점가공정도%무연사광속
axicon%vertex manufacture precision%non-diffracting beam
由菲涅耳衍射理论出发,分析了轴棱锥顶点加工精度对光束传输特性的影响.分析指出,当轴棱锥顶点加工成圆形时,它相当于一个平凸镜,对光束起点聚焦作用;而真实加工成的轴棱锥更贴近双曲线顶点模型,这时衍射光束因为干涉效应产生强烈振荡,形成畸变无衍射光束.理论推导了不同顶点加工轴棱锥的衍射光场表达式,模拟分析了光束传输变换特性,最后针对双曲线顶点加工的轴棱锥提出通过遮挡中心入射光线消除顶点由不同频率衍射光束叠加造成的干涉效应的改进方案,修正后的光束特性效果理想,对实际加工的轴棱锥应用具有指导意义.
由菲涅耳衍射理論齣髮,分析瞭軸稜錐頂點加工精度對光束傳輸特性的影響.分析指齣,噹軸稜錐頂點加工成圓形時,它相噹于一箇平凸鏡,對光束起點聚焦作用;而真實加工成的軸稜錐更貼近雙麯線頂點模型,這時衍射光束因為榦涉效應產生彊烈振盪,形成畸變無衍射光束.理論推導瞭不同頂點加工軸稜錐的衍射光場錶達式,模擬分析瞭光束傳輸變換特性,最後針對雙麯線頂點加工的軸稜錐提齣通過遮擋中心入射光線消除頂點由不同頻率衍射光束疊加造成的榦涉效應的改進方案,脩正後的光束特性效果理想,對實際加工的軸稜錐應用具有指導意義.
유비열이연사이론출발,분석료축릉추정점가공정도대광속전수특성적영향.분석지출,당축릉추정점가공성원형시,타상당우일개평철경,대광속기점취초작용;이진실가공성적축릉추경첩근쌍곡선정점모형,저시연사광속인위간섭효응산생강렬진탕,형성기변무연사광속.이론추도료불동정점가공축릉추적연사광장표체식,모의분석료광속전수변환특성,최후침대쌍곡선정점가공적축릉추제출통과차당중심입사광선소제정점유불동빈솔연사광속첩가조성적간섭효응적개진방안,수정후적광속특성효과이상,대실제가공적축릉추응용구유지도의의.
Based on the Fresnel diffraction theory,the influence of the vertex manufacture precision of an axicon on the light propagation is analyzed in detail.It is points out that the axicon is equal to a plano-convex lens for focusing the beams when the vertex is machined to a circle.However,the blunt-tip region of a real axicon can be described actually by a hyperbola,where the aberration non-diffracting beams will be formed due to the interference oscillation.This paper presents the theoretical derivations of diffractive fields from the axicon with different vertexes and analyzes and simulates their characteristics of beam propagation and transformation.Finally,a method for modifying the influence of a hyperbola-tip axicon is proposed to correct the interference effect and to obtain an approximate non-diffraction beam.It is shown that proposed method has guiding significance to the application of the real manufacture axicon.
