Crystal oscillators are loosely divided with the frequency they operate at and whether they are essential oscillators—function within 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 on the orthogonal thermal compensation https://alphabookmarking.com/story18843942/bulk-crystal-oscillator-an-overview