MOPA laser fiber laser with perfect characteristics and good pulse shape control. Laser design life of up to 50,000 hours. Meanwhile, MOPA fiber laser pulse frequency and pulse width are controlled independently, change in frequency does not affect the pulse width, in addition, the use of different pulse-width difference of the material processing characteristics, wide and narrow pulse each other ancillary processing, laser is applied to make broader marking material. Processing results easier to meet the demanding requirements of customers, the impossible becomes a Q-switched laser MOPA laser possible.