Crystal oscillators are loosely divided through the frequency they do the job at and whether or not they are elementary oscillators—operate with 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 based on https://growthbookmarks.com/story18891178/a-secret-weapon-for-bulk-crystal-oscillator