Proof of distributed feedback was the tuning of the laser wavelength over 130°A by changing the grating period, and the absence of shift in wavelength with increasing excitation current. 存在分佈反饋的證據是，改變光柵周期可使激光波長在130°A範圍內變化以及波長不隨激發電流的增大而移動。
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. 選擇合適的光柵周期，能獲得調諧範圍較寬的群速匹配脈衝參量放大，參量帶寬與晶體長度、非共線角及群速色散有關。
