The dependences of gain bandwidth on crystal length and pump intensity are also studied.Selecting appropriate grating period, wider tunable range can be obtained with group velocity matching.

• 选择合适的光栅周期，能获得调谐范围较宽的群速匹配脉冲参量放大，参量带宽与晶体长度、非共线角及群速色散有关。