Crystal oscillators are loosely divided from the frequency they function at and whether or not they are elementary oscillators—operate in the frequency marked over the can or at even multiples of that (overtone oscillators). Substantial-repetition-fee and large-ability picosecond regenerative amplifier based upon an individual bulk Nd:GdVO4 crystal 的很多特性，如温度稳定性，老化稳定性... https://bookmarks-hit.com/story19855649/an-unbiased-view-of-bulk-crystal-oscillator