Optical: systems and elements – Holographic system or element – Using modulated or plural reference beams
Patent
1991-02-26
1992-06-23
Arnold, Bruce Y.
Optical: systems and elements
Holographic system or element
Using modulated or plural reference beams
359 15, 359 28, 359 1, 359900, G03H 104
Patent
active
051248158
ABSTRACT:
Holographic optical elements relatively free of unwanted, secondary fringes are produced using light having a limited coherence. A photosensitive material of a predetermined thickness records the interference between two beams of light. The mutual coherence of the two illumination beams is sufficiently great to form high contrast interference fringes within some portion of the photosensitive medium. The mutual coherence is limited to prevent the formation of high contrast interference with reflections from the various parts of the construction optics. The two illumination beams may be incident from opposite sides of the photosensitive medium forming a reflection holographic optical element or from the same side of the photosensitive medium forming a transmission holographic optical element. A laser generates the first illumination beam. Control of the mutual coherence may be by passing the first illumination beam through a moving diffuser plate or by varying the wavelength of the laser during the exposure. The second illumination beam may be formed by a reflector in contact with the photosensitive medium or by a beam splitter.
REFERENCES:
patent: 4456328 (1984-06-01), Arns et al.
patent: 4458977 (1984-07-01), Arns et al.
patent: 4458978 (1984-07-01), Arns et al.
patent: 5015049 (1991-05-01), Chang
Siebert, L. D., "Holographic Coherence Length of a Pulse Laser", Applied Optics, vol. 10, No. 3, Mar. 1971 pp. 632-637.
Leith, E. M. and Leon, S., "Construction and Evaluation of HOEs Made in LiIght of Reduced Coherence", Applied Optics, vol. 23, No. 6, pp. 942-947, Mar. 15, 1984.
Arnold Bruce Y.
Kaiser Optical Systems
Parsons David R.
LandOfFree
Method for forming holographic optical elements free of secondar does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for forming holographic optical elements free of secondar, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for forming holographic optical elements free of secondar will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-937570