Holographic lens array and method for making the same

Details Holographic lens array and method for making the same Holographic lens array and method for making the same

1976-06-01

1978-04-04

Corbin, John K.

G02B 2700

Patent

active

040824152

ABSTRACT:
A novel hologram functioning as a multiple lenslet array of high density in which the lenslets have selected small spacings and relatively long focal lengths is disposed in a holographic data recording system to provide an object beam along a selected axis. Using the holographic lens array, a data hologram may be recorded with improved uniformity between data points, efficiency, hologram illumination, and with minimization of data beam blockage. In preparing the novel hologram, a coherent object beam may be used to define a plurality of sources for simultaneous recording of a plurality of lenslets. The lenslets of a refractive precursor array defined by a commercially available fly's eye lens may be illuminated simultaneously, and selected size, shape, spacing and f- number characteristics for the lenslets may be achieved by concurrent optical transformation of the individual beamlets before recording. The precursor array may advantageously be immersed in a surrounding fluid of controllable refractivity, to substantially increase the effective focal length at the precursor lenses, and enable a substantially larger area of each lenslet to be used.

REFERENCES:
patent: B453067 (1976-03-01), Kiemle
patent: 3405614 (1968-10-01), Lin et al.
patent: 3435244 (1969-03-01), Burckhardt et al.
patent: 3530442 (1970-09-01), Collier et al.
patent: 3658403 (1972-04-01), Greenaway et al.
patent: 3698810 (1972-10-01), Bestenreiner et al.
patent: 3744871 (1973-07-01), Takeda et al.
patent: 3752555 (1973-08-01), Klotz
patent: 3836224 (1974-09-01), Strehlow et al.
patent: 3941450 (1976-03-01), Spitz et al.

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