title: Guided wave optics in periodically poled KTP: quadratic nonlinearity and prospects for attosecond jitter characterization.
abstract: For the first time to our knowledge, continuous nonsegmented channel waveguides in periodically poled KTiOPO(4) with guided orthogonal polarizations are used to demonstrate type II background-free second harmonic generation in the telecom band with 1.6%/(W cm(2)) normalized conversion efficiency. This constitutes a 90-fold improvement in aggregate conversion efficiency over its free space counterpart. Simulations show that the guided wave device should enable the measurement of timing fluctuations of optical pulse trains at the attosecond level in an optical cross correlation scheme.
authors.affiliation: Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA. nejadmal@mit.edu
authors.forename: Amir H
authors.initials: AH
authors.lastname: Nejadmalayeri
authors.forename: Franco N C
authors.initials: FN
authors.lastname: Wong
authors.forename: Tony D
authors.initials: TD
authors.lastname: Roberts
authors.forename: Philip
authors.initials: P
authors.lastname: Battle
authors.forename: Franz X
authors.initials: FX
authors.lastname: Kärtner