Crystal oscillators are loosely divided through the frequency they work at and whether or not they are basic oscillators—work with the frequency marked around the can or at even multiples of that (overtone oscillators). We existing a Nd:GdVO4 bulk crystal oscillator with >70 WTEM00 laser output dependant on the orthogonal https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html