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In this paper, using the value theoretically calculated to emit multidirectionally a beam coming into an optical fiber with diameter of 125 μm, we modeled and produced a cone-shaped structure at the distal end of the fiber. A numerical simulation was performed for an optical fiber tip in which all incident beams were totally reflected and emitted toward the side, as well as for an optical fiber tip from which the beams could be emitted forward and sideways simultaneously. We produced multidirectional-firing optical fiber tips based on the simulation result and model. Laser fabrication of the optical fiber was done by processing a cone-shaped structure at the distal end of an optical fiber with diameter of 125 μm using a femtosecond pulsed laser and polishing the processed surface with a CO2 laser. We also conducted an analysis to compare experimental and simulation results.

Fabrication of a Multidirectional Side-firing Optical Fiber Tip and Its Numerical Analysis