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 according to 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 中原子或分子的排列具有三维空间的周期性，隔一定的距... https://maximusbookmarks.com/story19094233/the-2-minute-rule-for-bulk-crystal-oscillator