Crystal oscillators are loosely divided from the frequency they operate at and whether they are essential oscillators—perform at the frequency marked about 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://bookmarklinking.com/story5250934/bulk-crystal-oscillator-an-overview