Focal-plane detector imaging system with improved optical damage

Details Focal-plane detector imaging system with improved optical damage Focal-plane detector imaging system with improved optical damage

1995-07-20

1997-03-04

Healy, Brian

Optical waveguides

Optical fiber bundle

Imaging

385115, 385119, 385120, 349 65, G02B 606, G02F 113

Patent

active

056088337

ABSTRACT:
A focal-plane detector imaging system that can tolerate higher intensity optical beams than prior systems, without a reduction in the system's field-of-view, comprises an imaging lens, a fiber optic array positioned at the image plane of the imaging lens and an image detector positioned at the output end of the fiber optic array. The optical fibers that make up the fiber array have core diameters that are larger than the focal spot of an incoming optical beam. In operation, the fiber array transfers the imaged scene to the image detector at its output end. The focused optical beam is also transferred to the image detector at the array's output end, but its diameter is enlarged due to its angular divergence. In a preferred embodiment, the f-number of the imaging lens, diameter of the fiber cores, and the lengths of the fibers in the array are designed so that, as the power of an incoming optical beam increases, the optical damage threshold of the fiber array is reached before that of the image detector. An LCLV imaging system that incorporates the present invention is also provided.

REFERENCES:
patent: 4076378 (1978-02-01), Cole
patent: 4099833 (1978-07-01), Tosswill
patent: 4570063 (1986-02-01), De Bie et al.
patent: 4601537 (1986-07-01), Saccocio
patent: 5150445 (1992-09-01), Toyoda et al.
patent: 5159656 (1992-10-01), Goldstein
patent: 5394254 (1995-02-01), Cheng

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