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Generation of diffracted free fields and dark hollow beams using spatial filtering

机译:使用空间滤波生成衍射自由场和深色空心光束

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摘要

We describe the synthesis of diffraction free beams (DFB) and quasi diffraction free beams (qDFB) with features easily tunable using a holographic techniques. The hologram plate transmittance is generated by interfering two zero order Bessel beams with non-common axis. Spatial filtering techniques are implemented by controlling the kind of illumination during the reconstruction process. The experimental results are for illumination with the same kind of illumination that the recording process, obtaining a set of diffracting free beams. One of these propagates quasi-parallel to the surface hologram. For illumination with a plane wave we obtain dark hollow beam propagating in same direction that reconstruction beam. Experimental results are shown in both cases.
机译:我们描述了无衍射光束(DFB)和准无衍射光束(qDFB)的合成,其特征易于使用全息技术进行调整。通过干涉具有非公共轴的两个零阶贝塞尔光束来产生全息图板的透射率。通过在重建过程中控制照明的种类来实现空间滤波技术。实验结果是采用与记录过程相同的照明方式进行照明,从而获得一组衍射自由光束。其中之一准平行于表面全息图传播。对于平面波照明,我们获得了与重建光束在同一方向上传播的深色空心光束。在两种情况下均显示了实验结果。

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