Transversely Pumped Counterpropagating Optical Parametric Oscillation and Amplification

We show that the second-order nonlinear optical material in a waveguide can be used to achieve transversely pumped counterpropagating optical parametric oscillation and amplification based on our proposed novel interaction configuration. By changing the incident angle of the pump beam, one can tune the output frequency through a large range. Although the vertical and horizontal cavities are not required to establish the oscillation, they can be used to reduce the threshold pump power by several orders of magnitude. For the optimum semiconductor structure, the threshold pump power for the oscillation can be as low as ~100 {μ}W.