Interboard optical data distribution by Bessel beam shadowing
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.
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.