Currently, various optical fiber tips are used to deliver laser beam for endoscopic surgery. In this paper, we demonstrated multidirectional (forward and side) firing optical fiber tip using a femtosecond micromachining and CO2 laser polishing technology. We controlled the edge width of optical fiber tip, by modulating the condition of CO₂ laser, to regulate the amount of side and forward emission. The distal end of the optical fiber with core/clad diameter of 400/ 440 μm was microstructured with cone shape by using a femtosecond laser. And then the microstructured optical fiber tip was polished by CO₂ laser beam result in smoothing and specular reflection at the surface of the cone structure. Finally, we operated the LightTools simulation and good agreement was generally found between the proposed model and experimental simulation.
