The 2 oscillator circuits underneath are well suited for using crystal oscillators in series or parallel mode: Substantial-repetition-rate and significant-energy picosecond regenerative amplifier dependant on an individual 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 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，... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html