Sighting device for projectile type weapons for operation in day and night

A sighting device, comprising:

• a light source;
• and
• a fiber optic component, wherein said fiber optic component comprises a core and a cladding,
• wherein said core is clear, wherein said cladding comprises a fluorescent material which emits fluorescent light upon absorption of ambient light such that at least a portion of said emitted fluorescent light is emitted from a first end of said fiber optic component, wherein said light source is optically coupled to said fiber optic component such that at least a portion of the light emitted from said light source is coupled into said fiber optic component and is emitted from said first end of said fiber optic component,
• wherein said core has a graded refractive index profile,
• wherein the refractive index profile of said core is characterized as n ⁡ ( r ) = { n 1 ⁡ [ 1 - 2 ⁢ Δ ⁡ ( r / a ) g ] 1 / 2 r ≤ a n 2 r > a
• where r is the radial distance from the lens axis, a is the radius of the lens, n1, and n2 are the refractive indices at r=0 and r=a, the parameter g controls the index profile as a function of radius, n1≦n2, and 2Δ=(n12−n22)/n12.