发明名称 |
HOLOGRAPHISCHE LASERABTASTVORRICHTUNG UND ABSTANDBESTIMMUNGSVORRICHTUNG |
摘要 |
<p>A holographic optical element (HOE) includes a substrate structure having rotational symmetry with respect to a rotational axis for rotatively supporting at least two holograms. A first hologram on the substrate structure in the path of a normally incident beam diffracts the beam by a first acute angle and in a first radial direction from the rotational axis to a first redirected path. A second hologram on the substrate structure in the first redirected path diffracts the beam by a different second acute angle and in an opposite second radial direction from the rotational axis to a second redirected path. As a result, the two holograms may be used to achieve a second redirected path at an angle to the rotational axis that has a size which is the difference between the size of the first angle and the size of the second angle. The substrate structure may include first, second, and third disc-shaped substrates bonded together so that the third substrate is in between the first and second substrates, and a thin-film interference filter may be included on the third substrate to suppress zero-order leakage through the first hologram. The filter element may include one of a dielectric stack, a transmission hologram, or a reflectance hologram. The first hologram may be imprinted to achieve total internal reflection of zero-order leakage through the second hologram. An additional interference filter may be included on either the output face of the HOE or on a separate window element in order to reflects any zero-order leakage from the second hologram. The HOE may also have Schmidt-type aberration correction superimposed on at least one of the holograms to compensate for spherical aberrations from an all spherical Cassegrain type of telescope.</p> |
申请公布号 |
DE69421697(D1) |
申请公布日期 |
1999.12.23 |
申请号 |
DE1994621697 |
申请日期 |
1994.04.20 |
申请人 |
NORTHROP GRUMMAN CORP., LOS ANGELES |
发明人 |
HALL, JAMES;O'CONNOR, ARTHUR;RAFFENSPERGER, SUSAN;LEVINE, SEYMOUR |
分类号 |
B64D45/08;G02B26/10;(IPC1-7):G02B26/10 |
主分类号 |
B64D45/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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