Crystal oscillators are loosely divided from the frequency they operate at and whether they are elementary oscillators—function for the frequency marked within the can or at even multiples of that (overtone oscillators). Superior-repetition-price and significant-power picosecond regenerative amplifier determined by only one bulk Nd:GdVO4 crystal 的很多特性，如温度稳定性，老化稳定性，... https://push2bookmark.com/story19104390/bulk-crystal-oscillator-an-overview