We demonstrated a method for computer-generated holograms fabricated by using a femtosecond Bessel beam. A high-efficiency point-by-point process was used to fabricate a longitudinal modified array with a period of 10 μm and a modified area with diameter of approximately 1.5 μm on transparent glass. Tuning the modified length of each area by changing the relative positions of the Bessel beam and sample allowed the phase profile of the incident light to be flexibly adjusted to generate an arbitrary far-field pattern. The approach was verified by inscribing a designed phase hologram in borosilicate glass. Twin images were eliminated by high-level modulation.

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飞秒贝塞尔光束在石英玻璃中高效制备计算机生成的全息图

我们演示了一种使用飞秒贝塞尔光束制造的计算机生成全息图的方法。使用高效的逐点工艺在透明玻璃上制作了周期为10μm，直径为约1.5μm的修饰区域的纵向修饰阵列。通过改变贝塞尔光束和样本的相对位置来调整每个区域的修改长度，可以灵活地调整入射光的相位分布，以生成任意的远场图案。通过在硼硅酸盐玻璃中刻上设计的相全息图，验证了该方法。通过高级调制消除了双图像。