The two oscillator circuits under are suitable for using crystal oscillators in collection or parallel method: High-repetition-charge and superior-energy picosecond regenerative amplifier determined by a single 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 higher electrical power passively method-locked picosecond oscillator bas... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html