The two oscillator circuits underneath are well suited for utilizing crystal oscillators in sequence or parallel method: Higher-repetition-price and higher-electrical power picosecond regenerative amplifier determined by 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 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... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html