Crystal oscillators are loosely divided by the frequency they work at and whether they are fundamental oscillators—function at the frequency marked on the can or at even multiples of that (overtone oscillators). Higher-repetition-fee and high-electrical power 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，等效电路参... https://hylistings.com/story20089360/a-secret-weapon-for-bulk-crystal-oscillator