Spontaneous parametric down-conversion in periodically poled KTP waveguides and bulk crystals Fiorentino, Marco ; Spillane, Sean M. ; Beausoleil, Raymond G. ; Roberts, Tony D. ; Battle, Philip ; Munro, Mark W. Abstract Publication: Optics Express Pub Date: June 2007 DOI: 10.1364/OE.15.007479 Bibcode: 2007OExpr..15.7479F