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• W2100021279 abstract "A combined experimental/computational approach is conducted using a speciallydesigned laboratory facility and a physical framework based on refractive fluid interfaces in order to examine the cumulative aero-optical interactions along laser beam propagation paths as well as the turbulent refractive-index field. The experiments are conducted in the UC Irvine aero-optics variable-pressure turbulent flow facility which enables direct imaging of the turbulent refractive-index field at large Reynolds numbers. The flow facility is employed to generate compressible separated shear layers in a pressurized test section. The elevated pressures have the advantage of enhancing the imaging signal utilized to probe, non-invasively, the refractive-index variations. Laser-induced fluorescence of acetone vapor molecularly seeded in air is utilized to directly image the turbulent refractive-index spatial fluctuations along the beam propagation paths. A custom-built high-resolution Shack-Hartmann wavefront sensor enables imaging of the optical-wavefront distortions of the propagated optical beam. The flow images and propagated-wavefront data, combined with computations of the aberrations of the beam along each part of the propagation path through the flow, enable a study of the cumulative aero-optical interactions. The cumulative root-mean-square of the optical path dierence (OPD r.m.s.) and the cumulative Strehl ratio are evaluated as a function of distance along the beam propagation path. These cumulative aero-optical measures, evaluated for finiteaperture laser wavefronts propagating through individual flow realizations, are found to exhibit behavior that can be non-monotonic with increasing propagation distance. This, at first perhaps surprising observation, seems to reflect physically that dierent parts of the wavefront can accumulate distortions at dierent rates. The non-monotonicity suggests, in other words, that dierent parts of the wavefront dynamically accumulate distortions at dierent rates. These can collectively decrease as well as increase the aperture-integrated OPD r.m.s., or increase as well as decrease the Strehl ratio, along certain parts of the propagation path for finite-aperture beams. This finding needs to be further explored since it has new implications for the development of fluid mechanical methods for aero-optical optimization." @default.
• W2100021279 created "2016-06-24" @default.
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• W2100021279 date "2006-01-09" @default.
• W2100021279 modified "2023-09-27" @default.
• W2100021279 title "Cumulative Aero-Optical Interactions Along Laser Beam Propagation Paths: Experiments and Computations" @default.
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• W2100021279 doi "https://doi.org/10.2514/6.2006-1495" @default.
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