Crystal oscillators are loosely divided via the frequency they perform at and whether or not they are basic oscillators—operate at the frequency marked about the can or at even multiples of that (overtone oscillators). Significant-repetition-price and superior-power picosecond regenerative amplifier depending on 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... https://kingslists.com/story20170137/rumored-buzz-on-bulk-crystal-oscillator