Crystal oscillators are loosely divided through the frequency they work at and whether they are essential oscillators—work for the frequency marked on the can or at even multiples of that (overtone oscillators). We existing a Nd:GdVO4 bulk crystal oscillator with >70 WTEM00 laser output based upon the orthogonal thermal payment https://wavesocialmedia.com/story4546003/little-known-facts-about-bulk-crystal-oscillator