We describe the efficient conversion of light from a laser diode into a Bessel beam whose axial intensity varies almost uniformly with distance using only a holographic optical element. An interesting shadowing property of the Bessel beam is demonstrated where on blocking the intense central spot the propagating ring pattern acts to reform the central spot a short distance following the obstruction. This behaviour together with the long propagation range for the Bessel beam's central spot are considered for multiboard optical interconnects.

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Journal Optics Communications
MacDonald, R.P., Boothroyd, S.A., Okamoto, T., Chrostowski, J., & Syrett, B. (1996). Interboard optical data distribution by Bessel beam shadowing. Optics Communications, 122(4-6), 169–177.