Crystal oscillators are loosely divided by the frequency they get the job done at and whether they are elementary oscillators—get the job done in the frequency marked over 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