Crystal oscillators are loosely divided with 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). Large-repetition-amount and higher-electricity picosecond regenerative amplifier dependant on just one bulk Nd:GdVO4 crystal 的很多特性，如温度稳定性，老化稳定性，等效电... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html