The 2 oscillator circuits below are ideal for making use of crystal oscillators in series or parallel manner: Large-repetition-price and higher-energy picosecond regenerative amplifier according to just 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 substantial electric power passively mode-locked picosecond oscillator depend... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html