Broadband coherent infrared radiation has numerous applications in chemical, biological and material science. In particular, the spectral region spanning 2–20 µm is highly sought after for chemical identification [1]. Recently, intra-pulse difference-frequency generation based on 2 µm lasers has emerged as a promising technique for robustly generating broadband coherent mid-infrared radiation [2–5]. It can also provide few-cycle pulses [6] with intrinsic carrier-envelope phase stabilization—critical for time domain and frequency comb applications. Here we present a table-top IDFG system that can simultaneously cover most of the spectral region of interest at hundred-mW-level average power.

© 2019 IEEE

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