Crystal oscillators are loosely divided by the frequency they function at and whether they are basic oscillators—operate for the frequency marked over the can or at even multiples of that (overtone oscillators). We existing a Nd:GdVO4 bulk crystal oscillator with >70 WTEM00 laser output according to the orthogonal thermal compensation https://moodjhomedia.com/story2565988/what-does-bulk-crystal-oscillator-mean