We discuss two novel entanglement sources utilizing spontaneous parametric downconversion in periodically poled waveguides. Using quasi-phase matched KTP crystals, we have demonstrated a post-selection-based polarization entangled degenerate source at 810 nm, as well as a post-selection-free non-degenerate collinear source producing entangled photons at 810 nm and 1550 nm. The sources exhibit high brightness and state quality – with the non-degenerate source achieving fidelities and purities up to 99% – with clear paths for further improvement. Furthermore, they are compact, stable, and need little alignment when set, critical for practical quantum communication and network applications. Lastly, their small size, weight, and power (SWaP) makes them an attractive option for mobile platforms, e.g., with drones or satellites.
UV wavelength laser sources are an important area of research due to their use in atmospheric and atomic sensing; however, diode lasers at these wavelengths often have low power, poor spatial mode quality, and broad optical spectra. An alternative approach to a UV laser source is an IR diode laser with frequency conversion. In this work, a dual element ridge waveguide device is presented for third harmonic generation of UV wavelengths. This design has been successfully implemented to generate and sustain 3mW of UV from 200mW of IR pump in the waveguide.
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