Organic compounds -- part of the class 532-570 series – Organic compounds – Silicon containing
Patent
1990-12-04
1993-07-13
Turner, Samuel A.
Organic compounds -- part of the class 532-570 series
Organic compounds
Silicon containing
356348, 356351, 359902, 250226, G01B 9021
Patent
active
052278590
ABSTRACT:
Holographic optical elements are utilized for discriminating between monochromatic, coherent radiation and broadband, noncoherent radiation in passive coherent radiation detection systems such as aircraft warning systems and submarine laser communication systems. Coherent laser light can possess an extremely high energy density, directivity, (i.e., collimation), and a very narrow wavelength band when compared to natural or man-made, broadband white light sources. The concentration of laser light energy by a holographic optical element at the detector stage is a consequence of its special characteristics. Moreover, equally important, the diffracted light distribution in the neighborhood of the detector possesses a unique, bright geometric pattern not readily obtained with noncoherent sources. This geometric pattern is used as a laser wavelength detector for determination of the incident angular direction of the laser beam, as well as a coherent
oncoherent light discriminator. Since it is a passive component, a holographic optical element detects pulsed as well as continuous wave illumination, and some designs are basically independent of wavelength.
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Pernick et al., "The Formation and Optimization of Interferometric Fringes," American Journal of Physics, vol. 46, pp. 90-93, Jan. 1978.
Leib Kenneth G.
Pernick Benjamin J.
Grumman Aerospace Corporation
Keesee, II LaCharles
Turner Samuel A.
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