The two oscillator circuits down below are appropriate for using 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 A superior power passively mode-locked picosecond osci... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html