The 2 oscillator circuits below are suited to using crystal oscillators in sequence or parallel mode: Substantial-repetition-rate and large-ability picosecond regenerative amplifier according to 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 power passively mode-locked picosecond oscillator depending on Nd:GdVO4 crys... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html