Patent ID: 8169692

Claim:
An optical system comprising: an optical source providing a continuous wave or pulsed signal beam; a pump source providing a continuous wave or pulsed pump beam; and a parametric device including a multi-mode waveguide having a size that allows propagation of multiple optical modes, said waveguide receiving the signal beam and the pump beam where the signal beam and the pump beam are introduced into the waveguide at only a lowest order fundamental propagation mode of the waveguide so that only the fundamental mode is excited in the waveguide, said waveguide including non-linear orientation layers that alternate in a predetermined pattern in a propagation direction of the signal beam and the pump beam, said orientation layers having oppositely orientated crystal lattices that provide non-linear coupling, wherein the waveguide has a width of about 500 μm and a height in the range of 10-100 μm to provide a high power output beam.