The 2 oscillator circuits below are appropriate for applying crystal oscillators in series or parallel method: High-repetition-fee and superior-energy picosecond regenerative amplifier determined by 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 high ability passively manner-locked picosecond oscillator based upon Nd:GdV... https://top100bookmark.com/story19120616/the-2-minute-rule-for-bulk-crystal-oscillator