The two oscillator circuits beneath are ideal for using crystal oscillators in sequence or parallel manner: Large-repetition-level and significant-ability picosecond regenerative amplifier based on only 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 high electricity passively mode-locked picosecond oscillator based on Nd:GdVO... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html