Optical phase conjugation and waveguide coupling by cascading transverse second-harmonic and difference-frequency generation in a vertical cavity |
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| Authors: | Y. J. Ding J. B. Khurgin Seung-Joon Lee |
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| Affiliation: | (1) Department of Physics and Astronomy, Center for Materials, Bowling Green State University, 43403 Bowling Green, OH, USA;(2) Center for Photochemical Sciences, Bowling Green State University, 43403 Bowling Green, OH, USA;(3) Department of Electrical and Computer Engineering, The Johns Hopkins University, 21218 Baltimore, MD, USA |
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| Abstract: | We propose a novel scheme for implementing optical phase conjugation (OPC) by cascading transverse second-harmonic and difference-frequency generation in a vertical cavity. We propose to achieve phase conjugation in the pump and input-output two-waveguide structure. For a symmetric waveguide structure, the structure can be used as an optical phase conjugate mirror. For a realistic structure based on III–V semiconductor materials, a pump power per unit waveguide of 0.74 W  m-1 is required to reach a conversion efficiency of  9.4%. Combined with another phase-conjugate mirror, the reflectivity of the proposed phase-conjugate mirror can be efficiently modulated by control of the pump power. For an asymmetric waveguide structure, a gain is predicted. In addition, by cascading second-harmonic generation (SHG) and parametric oscillation, we propose to use the same structure as a waveguide coupler. There is a threshold to achieve coupling. |
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