Focused-image hologram system providing increased optical readou

Details Focused-image hologram system providing increased optical readou Focused-image hologram system providing increased optical readou

1974-09-20

1976-06-08

Stern, Ronald J.

G03H 122

Patent

active

039618366

ABSTRACT:
A focused-image hologram recorded in a thin phase medium having a high-frequency line spacing, such that the ratio of this line spacing to the wavelength of the readout light beam is greater than one but less than two, when read out with a light beam inclined at an angle greater than 30.degree. with respect to the normal to the plane of the focused image hologram, results in an optical readout efficiency approaching 50%, compared to the theoretical maximum optical readout efficiency of about 34% of a coarse sinusoidal phase grating having a line spacing much larger tha twice the wavelength of the readout light beam.

REFERENCES:
patent: 3743507 (1973-07-01), Ih et al.
patent: 3754808 (1973-08-01), Clay et al.

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