The 2 oscillator circuits below are appropriate for using crystal oscillators in sequence or parallel mode: Significant-repetition-rate and large-ability picosecond regenerative amplifier depending on 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 energy passively method-locked picosecond oscillator determined by Nd:GdVO... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html