The two oscillator circuits down below are ideal for applying crystal oscillators in sequence or parallel manner: Superior-repetition-price and significant-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 higher electrical power passively method-locked picosecond oscill... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html