The 2 oscillator circuits beneath are well suited for making use of crystal oscillators in collection or parallel method: High-repetition-fee and superior-energy picosecond regenerative amplifier based upon a single 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 oscillator accord... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html