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Chip-Scale Beta-Barium Borate Platform for Near-Infrared to Deep-Ultraviolet Nonlinear Integrated Photonics

There is growing interest in exploiting the versatility of integrated photonic circuits for a variety of applications from spectroscopy and imaging to quantum information processing, requiring spectral windows that extend into the deep-ultraviolet (deep-UV) wavelength range, combined with low optical losses including multi-photon absorption. Moreover, nonlinear optical processes are essential for the implementation of functionalities such as amplitude and phase control of light as well as frequency conversion. Currently developed platforms including lithium niobate, however, fall short of satisfying the aforementioned requirements.