The two oscillator circuits below are well suited for working with crystal oscillators in sequence or parallel mode: Large-repetition-level and substantial-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 A high electrical power passively manner-locked picosecond osc... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html