Mould field adapter and fiber laser

The utility model provides a mould field adapter and fiber laser belongs to fiber optic coupling technical field, mould field adapter includes a single mode fiber, the 2nd single mode fiber and matees optic fibre, a single mode fiber's core diameter is greater than the 2nd single mode fiber's core diameter, the core diameter that matches optic fibre is greater than the 2nd single mode fiber's core diameter, just the core diameter that matches optic fibre is less than a single mode fiber's core diameter, mate the one end of optic fibre and a single mode fiber's one end coupling, the other end that matches optic fibre with the 2nd single mode fiber's one end coupling. The utility model provides a mould field adapter is compared in traditional cone type mould field adapter that draws, and simple manufacture is high -efficient, and is with low costs, and stability and yield are high, but batch production. In addition, because this mould field adapter can bidirectional possibility, the utility model provides a fib