The 2 oscillator circuits down below are suitable for utilizing crystal oscillators in sequence or parallel method: Substantial-repetition-rate and higher-electric power picosecond regenerative amplifier based on just 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 large electric power passively manner-locked picosecond oscill... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html