The two oscillator circuits down below are appropriate for applying crystal oscillators in sequence or parallel manner: Large-repetition-amount and higher-electricity picosecond regenerative amplifier based on an individual 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 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，... https://socialinplace.com/story4366260/a-simple-key-for-bulk-crystal-oscillator-unveiled