研究目的

To study the enhancement of stimulated Raman scattering (SRS) with a GaAs/AlAs intermixed superlattice that works as a χ (3)-quasi-phase-matched structure, including the effects of Kerr-induced phenomena such as four-wave mixing (FWM), self-phase-modulation (SPM), cross-phase-modulation (XPM), and two-photon absorption (TPA), with a focus on improving the efficiency of anti-Stokes generation.

研究成果

The GaAs/AlAs intermixed superlattice significantly enhances the efficiency of anti-Stokes generation in SRS by quasi-phase-matching, achieving up to a 103-fold improvement compared to non-superlattice structures. The study identifies an optimal superlattice length for maximum efficiency and analyzes the degradation effects of TPA. The proposed photonic-band-gap cavity structure offers a potential method to further increase anti-Stokes efficiency or control the relative efficiencies of Stokes and anti-Stokes generation.

研究不足

The study primarily focuses on theoretical modeling and numerical simulations, with experimental validation not included. The analysis assumes specific conditions such as the absence of significant additional optical scattering loss caused by interface roughness and ignores the influence of stimulated Brillouin scattering (SBS) under certain conditions. The practical implementation of the proposed device may face challenges related to fabrication precision and material properties.