Study On The Design And Simulation Of Infrared Photonic Crystal Fiber Energy Transfer System

With the in-depth study of the infrared technology, the CO₂laser has developed rapidly, itcan be used in laser medical, military applications and laser processing for its superior performance.But in the process of transmission, the laser can not achieve the desired results because of theaffect of transporting materials. In recent years, it is expected that the optical fibers to be usedinstead of the traditional transport material for laser energy transmission.The materials andstructures of the infrared optical fiber have been extensively studied and achieved certain results indomestic and overseas. Compared to the conventional fiber, photonic crystal fiber has become a hotresearch topic with high coupling efficiency, low bending loss and nonlinear dispersioncontrollability. In order to achieve a more widespread application, how to design the infraredphotonic crystal fiber system which can be used for the transmission of laser energy andobtain a high efficiency has a profound significance.In this paper, the laser is better coupled into the infrared photonic crystal fiber by thebeam expander and focusing lens.The photonic band gap of photonic crystal fiber is triangularstructure, and the material is Te₂₀As₃₀Se₅₀glass with good permeability in the10.6μm band. Theband gap diagram and loss characteristics of photonic crystal fiber are analyzed with PWM andFEM method. The loss diagram is given according to different air factor, cladding layers numberand lattice constant of the infrared photonic crystal fiber. Based on the variation of the loss diagram,infrared fiber is designed which its lattice constant is7.5μm, the air factor is0.78, the radius of thefiber core is27μm, and the layers are8.During the Coupling process between the laser and fiber, the beam expander is used tocollimate the beam. By using the Zemax software, the model of laser light coupling to optical fiberusing the ZnSe lens has been simulated. The parameters r₁=32.8mm, r₂=-90.6mm and the thicknessof the lens is designed as3mm, the thickness is10mm, BFL=34.1mm. The value of coupling is93.7%. Finally, the practical application of the general block diagram is given, and the influentialfactors are analyzed. It has practical significance for infrared photonic crystal fiber Transmissionlaser energy.