title: Efficient, octave-spanning difference-frequency generation using few-cycle pulses in simple collinear geometry.
abstract: We present experimental observations and corresponding numerical simulations illustrating the difference-frequency generation of mid-infrared radiation using few-cycle near-infrared-to-visible pulses, which yields conversion efficiencies above 12% in beta-barium borate crystal. Type I and type II phase-matching are shown to yield qualitatively different intensity-scaling behavior, with the former showing higher overall efficiency, especially with the addition of a zero-order wave plate for modifying the polarization state of the pulse, and the latter having a better stability of the spectrum versus input intensity.
authors: Hanieh
authors: H
authors: Fattahi
authors: Alexander
authors: A
authors: Schwarz
authors: Sabine
authors: S
authors: Keiber
authors: Nicholas
authors: N
authors: Karpowicz