The 2 oscillator circuits under are suitable for employing crystal oscillators in series 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 ）是有明确衍射图案的固体，其原子或分子在空间按一定规律周期重复地排列。 Nd:GdVO4 has... https://worldlistpro.com/story20735698/a-secret-weapon-for-bulk-crystal-oscillator