Radially polarized LG_(01)-mode Nd:YAG laser with annular pumping

摘要

We demonstrated a radially polarized, LG_(01)-mode Nd:YAG laser by applying annular-shaped pump light. The annular profile of the pump light was originated from the mode conversion inside a conventional multimode fiber under off-focus coupling condition. This laser gave a maximum output power of 1.2 W at 1,064 nm with a slope efficiency of 28.3 %.