Lens free of back focal points for use with high power light bea

Details Lens free of back focal points for use with high power light bea Lens free of back focal points for use with high power light bea

1977-05-16

1979-05-22

Clark, Conrad J.

Oscillators

Molecular or particle resonant type

350175R, 350276R, H01S 300

Patent

active

041562097

ABSTRACT:
A meniscus lens is disclosed for use in high power light beam applications, such as in the optics of a high power laser where the laser beam intensity is in excess of one megawatt per square centimeter. The meniscus lens is designed such that light rays reflected from the lens are divergent so that no back focal points are created by the lens. In this manner, undesired dielectric breakdowns and damage to optical components and the like are avoided due to reflected back focal points. In one embodiment of the present invention, the output mirror of a high power laser is deposited upon the convex face of a meniscus lens, such lens being designed to avoid back focal points, whereby the construction of the output mirror is greatly simplified.

REFERENCES:
patent: 3521192 (1970-07-01), DeMaria et al.
patent: 3544198 (1970-12-01), Metz et al.
patent: 3611184 (1971-10-01), Moore

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