Lens element incorporating narrow bandpass filter and usable in

Details Lens element incorporating narrow bandpass filter and usable in Lens element incorporating narrow bandpass filter and usable in

1977-05-12

1978-08-15

Clark, Conrad J.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

350 27, 350201, 250353, G02B 510, G02B 528

Patent

active

041068556

ABSTRACT:
An optical system utilizing a lens element having a spherical surface incorporating a narrow bandpass filter, with the spherical surface being of such configuration that converging rays are normal to its surface, thereby permitting the narrow bandpass filter to operate with minimum bandwith, thus maximizing the rejection of unwanted background radiation. The surface of the lens element opposite the surface having the narrow bandpass filter may incorporate a dichroic filter, enabling the lens element to operate in a dual mode, with the dichroic filter reflecting entering visible light energy but being transparent to laser light energy, and the narrow bandpass filter thereafter eliminating wavelengths outside a given laser spectrum. As an example, my novel lens element may be used as a part of a catadioptric objective system sensitive to both visible and laser light frequencies.

REFERENCES:
patent: 3191497 (1965-06-01), Matsui
patent: 3858046 (1973-12-01), Cubalchini
McKenney, D. B. and P. N. Slater "Design and Use of Interference Passband Filters with Wide Angle Lenses for Multispectral Photography", Applied Optics, vol. 9, No. 11, Nov. 1970, pp. 2435-2440.

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