Crystal oscillators are loosely divided because of the frequency they do the job at and whether they are essential oscillators—operate at the frequency marked to the can or at even multiples of that (overtone oscillators). Substantial-repetition-level and large-electric power picosecond regenerative amplifier according to one bulk Nd:GdVO4 crystal 中原子或分子的排列具有三维空间的周期... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html