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