20 June 2001 Far-field implications of laser transmission through a compressible shear field
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Proceedings Volume 4272, Free-Space Laser Communication Technologies XIII; (2001) https://doi.org/10.1117/12.430786
Event: Photonics West 2001 - LASE, 2001, San Jose, CA, United States
Abstract
Progress has recently been made in both the collection and modeling of fluid-optic disturbances imparted by compressible, shear flows. This field of research, termed Aero-Optics, has been motivated primarily by the development of directed-energy weapons; however, it is equally applicable to a general class of applications involving laser transmission and reception from aircraft. Examples of these-type applications include free-space, laser transmission from ground to air, from air to air and from air to space. In the present paper, we examine the effect of laser transmission through high-Mach-number, subsonic, compressible free shear layers on the ability to focus the beam on distant targets. Time-resolved time series of distorted wavefronts due to propagation through a Mach-0.8 free shear layer collected at the Aero-Optics facility at Arnold Engineering and Development Center, are used as the input to a Fourier-Optics routine that computes time series of far-field irradiance patterns. These patterns are then used to compute the time-averaged Strehl ratio directly, and these are compared to time-averaged Strehl ratios computed using the wavefront's rms Optical Path Differences and the large-aperture approximation. Conclusions are drawn about the appropriateness of using the large-aperture approximation for Aero-Optic-type wavefront aberrations.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
James M. Cicchiello, James M. Cicchiello, Edward J. Fitzgerald, Edward J. Fitzgerald, Eric J. Jumper, Eric J. Jumper, } "Far-field implications of laser transmission through a compressible shear field", Proc. SPIE 4272, Free-Space Laser Communication Technologies XIII, (20 June 2001); doi: 10.1117/12.430786; https://doi.org/10.1117/12.430786
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