Optical Techniques for Thermal Focusing.
Final rept. 30 Apr 74-30 Jan 76,
AVCO EVERETT RESEARCH LAB INC EVERETT MASS
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A scaled laboratory analog of atmospheric thermal blooming of high energy laser propagation was constructed and used to investigate uniformly illuminated apertures, both square and circular with obscurations, and wedge intensity profiles for square apertures, including windward edge concave circular apertures. Cylindrical astigmatic corrections and refocusing were also investigated. Interferograms of the phase shift in the propagation path during thermal blooming referred to the input aperture were taken for square apertures, for axisymmetric Gaussian intensity profiles and for the circularly apodized wedge intensities. The unobscured square or circular aperture gave twice the central intensity for heavy blooming in comparison to an infinite Gaussian.
- Lasers and Masers