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