Abstract Bessel beams are remarkable since they do not diverge. Accordingly, they have numerous applications ranging from precision laser micro-machining to laser particle acceleration. We demonstrate a novel approach for generating long-range Gauss-Bessel beams. A ring-shaped beam is produced by imprinting a vortex with high topological charge in a Gaussian beam. The phase singularities are thereafter removed and the ring-shaped beam focused/Fourier-transformed by a thin lens. This results in a remarkably good realization of a Gauss-Bessel beam. Divergence angles in the microradian range and Gauss-Bessel beam lengths up to 2.5 m behind the focal plane of the lens are demonstrated.

中文翻译：

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通过消除光学涡流产生远距离低发散高斯-贝塞尔光束

摘要 贝塞尔光束是非凡的，因为它们不发散。因此，它们有许多应用，从精密激光微加工到激光粒子加速。我们展示了一种生成远程高斯-贝塞尔光束的新方法。通过在高斯光束中压印具有高拓扑电荷的涡旋产生环形光束。此后相位奇点被去除，环形光束通过薄透镜聚焦/傅立叶变换。这导致高斯-贝塞尔光束的非常好的实现。展示了微弧度范围内的发散角和透镜焦平面后方高达 2.5 m 的高斯-贝塞尔光束长度。