The two oscillator circuits down below are appropriate for using crystal oscillators in sequence or parallel manner: Significant-repetition-price and substantial-ability picosecond regenerative amplifier depending on 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 significant power passively mode-locked picosecond oscilla... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html