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This manuscript presents an ultrafast-laser-absorption-spectroscopy (ULAS)diagnostic capable of providing calibration-free, single-shot measurements oftemperature and CO at 5 kHz in combustion gases at low and high pressures. Adetailed description of the spectral-fitting routine, data-processingprocedures, determination of the instrument response function, and practicalconsiderations for imaging ultrashort pulses in the mid-infrared are presented.The accuracy of the diagnostic was validated at 1000 K and pressures up to 40bar in a heated-gas cell before being applied to characterize thespatiotemporal evolution of temperature and CO in AP-HTPB and AP-HTPB-aluminumpropellant flames at pressures between 1 and 40 bar. The results presented heredemonstrate that ULAS in the mid-IR can provide high-fidelity, calibration-freemeasurements of gas properties with sub-nanosecond time resolution in harsh,high-pressure combustion environments representative of rocket motors.

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Ultrafast-laser-absorption spectroscopy in the mid-infrared for  single-shot, calibration-free temperature and species measurements in low-  and high-pressure combustion gases