Gas-phase single-shot thermometry at 1 kHz using fs-CARS spectroscopy

Single-laser-shot temperature measurements at a data rate of 1 kHz employing femtosecond coherent anti-Stokes Raman scattering (fs-CARS) spectroscopy of N₂ are demonstrated. The measurements are performed using a chirped-probe pulse to map the time-dependent frequency-spread dephasing of the Raman coherence, which is created by ~80-fs pump and Stokes beams, into the spectrum of the coherent anti-Stokes Raman scattering signal pulse. Temperature is determined from the spectral shape of the fs-CARS signal for probe delays of ~2 ps with respect to the pump-Stokes excitation. The accuracy and precision of the measurements for the 300–2400 K range are found to be ~1%–6% and ~1.5%–3%, respectively. ©2009 Optical Society of America

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