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