The 2 oscillator circuits down below are suited to using crystal oscillators in sequence or parallel mode: Large-repetition-level and large-ability picosecond regenerative amplifier according to one bulk Nd:GdVO4 crystal 中原子或分子的排列具有三维空间的周期性，隔一定的距离重复出现，这种周期性规律是 A significant ability passively mode-locked picosecond oscillator according to Nd:GdVO4... https://bookmark-master.com/story18982197/everything-about-bulk-crystal-oscillator