We demonstrate efficient generation of terahertz radiation (THz) by nonlinear down-conversion driven by trains of pulses of tunable duration, spacing, amplitude and number. The optical setup, based on cascaded interferometers, provides fine control over the pulse train parameters allowing precise control over the conversion efficiency of the process as well as over the THz frequency and pulse duration. Our approach enables thorough optimization of the conversion process, which theory predicts can reach multiple percent. We perform experiments and simulations of THz generation in periodically-poled lithium niobate and KTP to validate theory and determine conversion-efficiency limitations in a highly-optimized scenario.
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