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• W2031001133 abstract "A concept has been developed and demonstrated for a Beam Redistribution System (BRS) for use in ground based lethality testing of high energy laser (HEL) weapons systems. The BRS is a key component and test technique of any HEL lethality test range, and creates laser beam distributions and spot sizes on targets that are representative of those operationally incurred in actual weapon-on-target engagements. Operational laser beam distributions will always approximate that of a Gaussian beam because of diffraction, residual random jitter of the system, and random effects of the atmosphere during beam propagation. Further, beam size will be dominated by diffraction effects. HEL weapons currently planned are designed for shooting down ballistic missiles, artillery and mortar, ground mobile vehicles and fixed targets on the ground, and for negation of cruise missles and other unmanned aerial vehicles (UAVs). Three broad classes of HEL weapon systems are currently under development or in concept technology demonstration. These are the Airborne Laser (ABL), the Mobile Tactical High Energy Laser (MTHEL), and the Advanced Tactical Laser (ATL). A predecessor to MTHEL, the Tactical High Energy Laser (THEL) has undergone extensive testing over the past several years. The basis of the BRS concept is the construction of an array of mirrors projecting the HEL beam to the target at a safe distance typical of DOD test ranges, but at a much shorter distance relative to actual weapon operational use. Typical ground test range distances are several hundred meters, to a kilometer or so. Over these distances, without some auxiliary means of beam expansion and redistribution, spot sizes and distributions are not typical of those in operational use, which are considered Gaussian. The array of mirrors enable correct sizes and distributions to be realized by virtue of independently dithering each mirror with a 2-dimensional Gaussian distribution. The result is the sum of the convolutions of individual mirror Fresnel/Fraunhofer distributions with the Gaussian dithers. Over short time periods, these convolutions average to appropriate spot sizes with Gaussian distributions. An operational HEL lethality test range will contain a beam redistribution system that will either take an output directly from the laser of a HEL system, or take it out of the beam director, depending on the required test beam parameters. Shorter range systems such as MTHEL or ATL will use the beam from the beam director for ground-based tests, while long range systems such as ABL will use the beam directly from the HEL system. The reason for this is that to obtain the smaller spot sizes required to simulate performance of shorter range systems requires the beam aperture and focusing ability of the full system. On the other hand, an ABL will use a collimated beam from the laser and depend fully on diffraction to obtain the smallest required spot sizes, and use the dithering feature of the BRS mirrors to obtain intermediate and full spot sizes." @default.
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• W2031001133 date "2005-06-18" @default.
• W2031001133 modified "2023-10-05" @default.
• W2031001133 title "Beam Redistribution System - Enabling High Energy Laser Weapon Lethality Testing" @default.
• W2031001133 doi "https://doi.org/10.2514/6.2005-7648" @default.
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