Stratified volume holographic optical elements (SVHOE's) comprise a recently proposed class of novel diffraction structure, it's unique angular selectivity of the SVHOE's Bragg diffraction process have more promising applications. The previous study of SVHOE's are mainly based on isotropic materials, in this paper we study the diffraction properties of holographic gratings in anisotropic media separated by buffer layers using the method of Coupled wave theory. It is shown that the diffraction efficiency of such system also exist the uniform periodic angular sensitivity, in addition the dependence of the periodic SVHOE angular sensitivity on number of layers and total SVHOE thickness have been discussed.
It is necessary, on the ground in a laboratory, to test the technical parameters and to verify the working performance for the optical pointing, acquisition and tracking (PAT) of an inter-satellite lasercom terminal. In this paper, we report a completed PAT test-bed for this aim. The test-bed works in a fully physical way and is an integration of a 2D optical scanner of two rotating prisms, a 2D fine beam deflector of two tilting optical wedges and a double-focus laser collimator, the overall aperture is about Φ440mm. The optical scanner is designed to scan the beam in the range of 30° with an accuracy of 100μrad and used to simulate the mutual movement between two satellites. The fine beam deflector has the maximum beam deviation of about 1mrad with a step of 0.5μrad and is used to measure the tracking error of a terminal. The collimator has the double focal lengths, respectively, of 1.5m and 10m, the former provides a wide view of field for the use in the acquisition process of the terminal and the latter a narrow view of field for the use in the tracking process. In this paper, the design and fabrication considerations of the PAT test-bed as well as the main specifications of the completed integrated test-bad are given.
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