Crystal oscillators are loosely divided with the frequency they get the job done at and whether they are elementary oscillators—work for 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 based on the https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html