The 2 oscillator circuits underneath are suited to employing crystal oscillators in sequence or parallel method: Superior-repetition-level and superior-electric 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 A substantial energy passively method-locked picosecond oscill... https://getidealist.com/story20705268/the-best-side-of-bulk-crystal-oscillator