Crystal oscillators are loosely divided through the frequency they operate at and whether they are elementary oscillators—function within 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 upon the orthogonal thermal compensation https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html