The 2 oscillator circuits under are suitable for employing crystal oscillators in series or parallel method: Large-repetition-amount and higher-electricity picosecond regenerative amplifier based 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，这种周期性... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html