Study on end treatment process and laser performance of Yb doped PCF (Invited)

An efficient and fast processing technology of photonic crystal fiber (PCF) end face based on the homemade Ytterbium (Yb) doped large mode area (LMA) PCF was demonstrated. By using carbon dioxide laser splicer, the PCF was rotated and laser heated at the same time. The optimal heating power and time were determined by comparing the collapse effect of the fiber under different laser heating power and heating time. For examining the optical fiber treated, the fiber laser system was built. The experiment results indicate that the collapse of the end face does not have a great influence on the laser properties of the fiber when it is compared with laser experiments without end processing results. High quality PCF collapse face can be achieved by the experimental method described, the air holes collapsed boundary are neat and uniform, meanwhile the influence of the collapse treated on the laser properties of the optical fiber is not obvious. The experimental process is short and the success rate is high, which proves that it is an effective method to deal with the end face of PCF by laser heating collapse, greatly expands the use range of the PCF, and has very strong practical value.