The two oscillator circuits down below are appropriate for applying crystal oscillators in sequence or parallel manner: Substantial-repetition-level and large-electric power picosecond regenerative amplifier based 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 substantial power passively method-locked picosecond ... https://active-bookmarks.com/story18856461/the-2-minute-rule-for-bulk-crystal-oscillator