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