Method for measuring gradient index distribution of rod lens

Details Method for measuring gradient index distribution of rod lens Method for measuring gradient index distribution of rod lens

2005-07-19

2005-07-19

Smith, Zandra V. (Department: 2877)

Optics: measuring and testing

Lens or reflective image former testing

C356S128000

Reexamination Certificate

active

06919953

ABSTRACT:
A method of measuring a radial index distribution of a rod lens has the steps: (1) the rod lens is processed so that the length is approximately P/2 (where P is pitch length) or an integer multiple thereof and so end surfaces parallel, (2) a patterned surface is set as an object surface in the proximity of one end surface, and an image surface is formed in the proximity of the other end surface by irradiating the patterned surface with condensed monochromatic light, (3) the positions of paraxial focal points and the curves of curvature of field are obtained by observing the image surface, and (4) higher-order index distribution coefficients are calculated back by a fitting process on the basis of the positions of paraxial focal points and the curves of curvature of field.

REFERENCES:
patent: RE33227 (1990-06-01), Baba
patent: 5949585 (1999-09-01), Kittaka
patent: 55044949 (1980-03-01), None
Toyama, Minoru, et al., “Measurement and Analysis of Spherical Aberration of Gradient-index Rod Lenses”, Optics, vol. 11, No. 6, (Dec. 1982).

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