The few-cycle pulse was focused into a quadratic nonlinear crystal using an off-axis parabolic mirror (f = 25 mm) to drive intra-pulse DFG and produce MIR light. We generated light from 3- to 5.5-μm light in a 1-mm-thick PPLN with power ranging from 500 μW to 1.2 mW. In OP-GaP, a 1-mm-thick fanout crystal with grating periods in the range of 50 to 65 μm was used to generate broadband long-wave infrared light. The spectrum spanning 4 to 20 μm was generated in a 63-μm grating period and corresponded to 100 to 200 μW. The center frequency of the spectrum was determined by calculating its center of mass after deconvolving the spectrum using the response function. In a 500-μm-thick GaSe, type II phase matching was used, and the broadband spectrum provided approximately 2 μW across the entire band.

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