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Creators/Authors contains: "Stevenson, Anna"

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  1. ; (, American Institute of Aeronautics and Astronautics)
    Hybrid fs/ps coherent anti-Stokes Raman scattering employing coherent control is presented for selective excitation of combustion-relevant species. Femtosecond pulse shaping is accomplished experimentally using a 4-f pulse shaper with a spatial light modulator at the Fourier plane. A feedback-controlled genetic algorithm for adaptive pulse shaping is used to optimize for the selective excitation of CO2 (near 1388 cm−1) and O2 (near 1556 cm−1) rovibrational transitions in a non-reacting flow. 0D fs/ps CARS measurements acquired in a near-adiabatic flame demonstrate the use of coherent control in a combustion environment. 
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    Free, publicly-accessible full text available January 3, 2026
  2. ; ; ; (, American Institute of Aeronautics and Astronautics)
    A hybrid femtosecond/picosecond coherent anti-Stokes Raman scattering (fs/ps CARS) system was developed for quantitative measurements of temperature in a laboratory-scale supersonic jet facility. Measurements were recorded at low pressures and densities relevant for supersonic and hypersonic environments, with special interest in exploring the feasibility of deploying this technique in the 20-inch Mach 6 and 31-inch Mach 10 wind tunnels located at NASA Langley Research Center. Modifications to the existing supersonic jet facility were made to simulate a test section with a width of 31 inches, so that the size of the test section is relevant for either wind tunnel. The CARS system was designed such that a similar beam geometry can be used in the laboratory to acquire point-based fs/ps CARS measurements along two axes of translation. Rotational Raman transitions of O2 and N2 were targeted. 
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