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