We present the concept of a cost-effective broadband SWIR-MIR mJ-level femtosecond laser source for hazardous gas detection by LIDAR based on multi-stage nonlinear conversion in readily available media. Developed affordable laser based on Yb:YAG rods with >10 mJ, ~1.2 ps output pulses at 1030 nm pump 3-stage OPCPA based on BiBO and simultaneously excite a supercontinuum in YAG for its seed. Output pulses amplified to >2 mJ in the wavelength range 1800 – 2400 nm with a pump-to-signal OPCPA conversion efficiency of ~30% after compression to <100 fs are used to generate rotational SRS in compressed nitrogen, hydrogen, or their mixtures to expand the spectrum beyond 3400 nm, limited by the spectrometer used.
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