Crystal oscillators are loosely divided via the frequency they get the job done at and whether or not they are essential oscillators—do the job within the frequency marked on the can or at even multiples of that (overtone oscillators). We existing a Nd:GdVO4 bulk crystal oscillator with >70 WTEM00 laser https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html