The 2 oscillator circuits down below are appropriate for applying crystal oscillators in series or parallel method: Substantial-repetition-level and high-electrical power picosecond regenerative amplifier determined by only 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 superior ability passively manner-locked picosecond osci... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html