- Jan 29, 2014
For CW, PPLN sure appears to be a poor choice. Only advantage I see so far is when using PPLN, you don't need a YVO4 crystal. I'm sure there must be an advantage though, else it would not be used. Studying.... I suppose one clear advantage is you can directly double some wavelengths to make colors such as yellow, which are otherwise more difficult to produce, but to make green, I don't see the advantage when far greater efficiency can be obtained using 808 nm>YVO4>1064nm>SHG 532 nm w/KTP..