Broad-spectrum achromatic phase shifters, phase modulators, freq

Details Broad-spectrum achromatic phase shifters, phase modulators, freq Broad-spectrum achromatic phase shifters, phase modulators, freq

1987-04-27

1988-11-22

Arnold, Bruce

Optics: measuring and testing

Range or remote distance finding

With photodetection

35016217, 35016224, 350358, 356345, G02B 532, G02B 518, G02F 111, G01B 902

Patent

active

047861240

ABSTRACT:
Achromatic optical systems forming phase shifters and phase modulators are presented and shown to impart (temporal) phase-angle shifts in incoming waves which are independent of wavelength over extremely broad spectral ranges (achromatic or white light). Three major classes of achromatic phase shifters are described including the triangle, close cascade, and imaged grating configurations. When constructed utilizing volume holographic optical elements, very high diffraction efficiencies may be achieved over the large bandwidths used. These systems may similarly be utilized to impart achromatic frequency shifts and frequency modulations which are wavelength independent over extreme spectral ranges and usually do not disturb the spatial form of the input waves. These devices may be used in AC interferometers and allow such interferometers to be operated with white light. The devices are also useful in switching between spatial sine and cosine optical transforms in optical pattern recognition systems.

REFERENCES:
patent: 3646470 (1972-02-01), Tsang
patent: 4091281 (1978-05-01), Willhelm
N. George & S. Wang, "Cosinusoidal Transforms in White Light", Applied Optics, vol. 23, p. 787, Mar. 15, 1984.
H. Kogelnik, "Reconstructing Response & Efficiency of Hologram Gratings," Proc. Symp. Modern Optics, Polytechnic Institute of Brooklyn, 1967, p. 605.
N. George & J. W. Matthews, "Holograph Diffraction Gratings", Applied Physics Letters, 9, 212 (1966).
R. V. Johnson & A. R. Tanguay, *Optical Engineering, Feb. 1986, vol. 25, 2, 235, *"Optical Beam Propagation Method for Birefringent Phase Grating Diffraction".
A. R. Tanguay & R. V. Johnson, J. Opt: Soc. of America A, Optics & Image Science, vol. 3, 13, p. 53 (Dec. 1986).
S. H. Lee, "Coherent Optical Processing" Optical Information Processing Fundamentals publisher Springer-Verlag, 1981.

Affiliated with

Also associated with

Rating

Broad-spectrum achromatic phase shifters, phase modulators, freq does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Broad-spectrum achromatic phase shifters, phase modulators, freq, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Broad-spectrum achromatic phase shifters, phase modulators, freq will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-431341