Photon-pair sources based on nonlinear optical processes, such as four-wave mixing (FWM) in polarization-maintaining fibers (PMFs), have become a key step for advancing quantum communication, computation, and metrology. A great advantage of these sources is that they can encode information in multiple degrees of freedom, including transverse spatial modes and frequencies, enabling high-dimensional quantum states …

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Measuring semiconductor nonlinear properties with femtosecond broadly tunable near-ir and mid-ir laser source based on optical parametric oscillators The unique optical properties of semiconductor optical properties are also reason why these materials are extremely useful in optoelectronic applications, especially as sensors. Also, some semiconductor materials can emit light and are used for the development of …

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Among the multiple methods for characterising the frequency response of fast photodetectors, using the heterodyne signal produced by the beating of two single-mode laser sources is one of the most common. When both lasers impinge on a biased photodetector, they generate a photocurrent at their difference frequency. Thus, the detector frequency response can be retrieved …

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