Abstract
Binary holographic diffraction gratings were developed to shape Gaussian laser-beam profiles into flattop profiles and to multiplex local oscillator wavefronts for use in active infrared laser radar systems. The use of detector arrays in such systems requires amplitude and phase matching of multi-beam local oscillators to signal wavefronts in order to maximize the system's signal-to-noise ratio and resolution and to minimize the heat generated on the focal plane. In addition, a beam shaper in the transmit beam of the laser radar must shape the centro-symmetric Gaussian profile of the laser beam into a stretched profile that efficiently and uniformly illuminates the far-field footprint of the detector array. Other potential applications include synthetic optical elements, laser beam samplers, and uses in laser annealing and optical communication.
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