Crystal oscillators are loosely divided through the frequency they perform at and whether they are elementary oscillators—work for the frequency marked around the can or at even multiples of that (overtone oscillators). Large-repetition-level and higher-electricity picosecond regenerative amplifier based on an individual bulk Nd:GdVO4 crystal 的很多特性，如温度稳定性，老化稳定性，等效... https://tetrabookmarks.com/story18982451/facts-about-bulk-crystal-oscillator-revealed