Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1992-07-30
1993-12-28
Look, Edward K.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
2502019, 359565, 359849, 356121, G02B 2744
Patent
active
052744795
ABSTRACT:
A procedure for supplying a mirror (22), such as the mirror of an astronomical telescope (60), with holographic optical elements (38), suitable for use with an active mirror alignment system such as a Hartman optical mirror alignment system, is accomplished by constructing each holographic optical element as a separate unitary structure of a transparent substrate (56) with zone plate features. The zone plate features include the channels (64) and ridges (66) of a fragmentary portion of a zone plate etched into a face (58) of the substrate. The substrate is mounted to the mirror by placing the etched face of the holographic optical element in contact with the reflecting surface (68) of the mirror. An adhesive (70) may be applied around the perimeter of the substrate to secure the substrate in its position upon the mirror. This arrangement of mounting the substrate to the mirror protects the etched face of the holographic optical element from environmental damage, and from the stripping and reapplying of a coating during a refurbishing of the mirror.
REFERENCES:
patent: 4986641 (1991-01-01), Braat
patent: 5198653 (1993-03-01), Shen et al.
patent: 5214535 (1993-05-01), Harris et al.
Slinger et al, "Off-axis holographic zone plates recorded and reconstructed by cylindrical wavefronts", Optica Acta, 1984, vol. 31, No. 7, pp. 745-758.
Shen Gon-Yen
Zmek William
Denson-Low Wanda K.
Hughes Aircraft Company
Look Edward K.
Lopez F. Daniel
Sales Michael W.
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