Importance

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Abstract

A compound refractive lens for neutrons is provided having a plurality of individual unit Fresnel lenses comprising a total of N in number. The unit lenses are aligned substantially along an axis, the i-th lens having a displacement t.sub.i orthogonal to the axis, with the axis located such that ##EQU1## Each of the unit lenses comprises a lens material having a refractive index decrement .delta.<1 at a wavelength .lambda.<200 Angstroms. In a preferred mode, the lens above is configured such that the displacements t.sub.i are distributed and have a standard deviation .sigma..sub.t of the displacements t.sub.i about the axis, and wherein each of the unit lens has a smallest Fresnel zone width of s.sub.n -s.sub.n-1, where s.sub.n and s.sub.n-1 are the zone radii of the n and n-1 zones and the standard deviation is .sigma..sub.t.ltoreq.[s.sub.n -s.sub.n-1 ]/4.

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First Claim