Work

Coherent control for species selectivity in a flat-flame using femtosecond/picosecond coherent Raman scattering

Year: 2025

Type: article

Abstract: Coherent control for the selective spectral suppression of combustion species using femtosecond/picosecond coherent anti-Stokes Raman scattering (fs/ps CARS) is presented. Phase modulation of one of the excitation pulses was accomplished using a 4- f pulse shaper with a spatial light modulator at the Fourier plane. A feedback-controlled genetic algorithm was used to search for the appropriate modulated waveform in a non-reacting gas jet of known composition; the selected phase function was subsequently applied in a H 2 /air flat-flame diluted with CO 2 . Q-branch transitions of O 2 and CO 2 were targeted. To our knowledge, this is the first demonstration of coherent control using fs/ps CARS for spectral species selectivity in a combustion environment. • First demonstration of coherent control with fs/ps CARS in a flame. • Optimal phase functions experimentally determined before application in a flame. • Amplification or annihilation of targeted rovibrational transitions was achieved.

Source: Applications in Energy and Combustion Science

DOI: 10.1016/j.jaecs.2025.100443

Authors: Anna L. Stevenson, Chloe E. Dedic

Institution: University of Virginia

Language: English

Topic: Spectroscopy and Laser Applications

Subfield: Spectroscopy

Field: Chemistry

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,910

Funders: National Science Foundation, University of Virginia, Rolls-Royce