Abstract
We investigate the dispersion properties of ridge Bragg-reflection waveguides to deduce their phasematching characteristics. These are crucial for exploiting them as sources of parametric down-conversion (PDC). In order to estimate the phasematching bandwidth we first determine the group refractive indices of the interacting modes via Fabry–Perot experiments in two distant wavelength regions. Second, by measuring the spectra of the emitted PDC photons, we gain access to their group index dispersion. Our results offer a simple approach for determining the PDC process parameters in the spectral domain, and provide important feedback for designing such sources, especially in the broadband case.
Highlights
Non-linear optics provides a variety of different frequency conversion processes for implementing diverse photonic states for quantum informatics
Our results offer a simple approach for determining the parametric down-conversion (PDC) process parameters in the spectral domain, and provide important feedback for designing such sources, especially in the broadband case
We are only interested in the phasematching bandwidth sPM that corresponds to the minor semiaxis in equation (9) after letting sp ¥ and obtain [34]
Summary
Non-linear optics provides a variety of different frequency conversion processes for implementing diverse photonic states for quantum informatics. Intriguing is the process of parametric down-conversion (PDC) known for producing photon-number correlated twin beams at a few photon level Due to their rich spectral structure, only very few of these sources intrinsically emit light into a single optical mode [1, 2]. The spectral properties of photon pairs created in the PDC process, which obeys energy and momentum conservation, depend both on the pump laser spectrum and on the phasematching condition in the second order non-linear optical material. Together they result in a joint spectral distribution (JSD) of the twin beams—typically called signal and idler [4, 5]. Our results provide straightforward access to the spectral PDC process parameters and are useful for optimizing the performance of such integrated optics devices
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