Crystal oscillators are loosely divided by the frequency they get the job done at and whether or not they are elementary oscillators—get the job done with the frequency marked to the can or at even multiples of that (overtone oscillators). We present a Nd:GdVO4 bulk crystal oscillator with >70 WTEM00 https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html