Crystal oscillators are loosely divided by the frequency they get the job done at and whether they are fundamental oscillators—get the job done on the frequency marked about the can or at even multiples of that (overtone oscillators). We present a Nd:GdVO4 bulk crystal oscillator with >70 WTEM00 laser output https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html