Crystal oscillators are loosely divided with the frequency they do the job at and whether or not they are fundamental oscillators—operate in the frequency marked over the can or at even multiples of that (overtone oscillators). Higher-repetition-fee and high-electrical power picosecond regenerative amplifier based upon just one bulk Nd:GdVO4 crystal https://livebackpage.com/story4365930/bulk-crystal-oscillator-for-dummies