We present a single-layer optical inference system based on nonlinear optical diffraction. In this system, input optical data is superposed with control parameters and then focused into a nonlinear optical crystal leading to second harmonic generation which serves as the output of the system. We demonstrate image classification while utilizing a very low number of degrees of freedom. Importantly, the performance of the system can be tuned by controlling the level of spatial mode mixing in the nonlinear crystal.
We show theoretically and numerically that a time-reversed replica of the pump pulse envelope in a frequency converted signal can be achieved using a nonlinear time lens realized with an accelerating spatiotemporal Quasi-Phase-Matching (QPM) modulation. The nonlinear process depends on a suitable combination of input and output dispersion, before and after the nonlinear time lens, and on the acceleration rate of a quadratic spatiotemporal QPM modulation.
Recently an all-optical Quasi Phase Matching (QPM) scheme for High Harmonic Generation (HHG) was introduced in which the pump beam was constructed in the form of an intensity grating whose periodicity could be easily tuned to allow selective enhancement of specific harmonic orders. This was performed using a two-component fundamental beam, superposing a Bessel beam and a Gaussian beam. Here we extend this scheme by constructing the pump as a travelling grating with both controlled periodicity and velocity - utilizing a spatiotemporal modulation, thus allowing both selective harmonic enhancement and fine-tuning of its frequency. Therefore, this scheme can be extremely useful for spectroscopic applications.
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