Crystal oscillators are loosely divided because of the frequency they work at and whether they are fundamental oscillators—work at 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 according to the orthogonal thermal https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html