Control of gradient index profile for gradient index glasses of macro size and large <delta>n for a varifocal slide projector lens

Xiaojie Xu; Max Andrew Wickson; Michael Savard; Paul Sherman

doi:10.1117/12.163665

25 November 1993 Control of gradient index profile for gradient index glasses of macro size and large Δn for a varifocal slide projector lens

Xiaojie Xu, Max Andrew Wickson, Michael Savard, Paul Sherman

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Proceedings Volume 2000, Current Developments in Optical Design and Optical Engineering III; (1993) https://doi.org/10.1117/12.163665
Event: SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, 1993, San Diego, CA, United States

Abstract

Axial gradient index lens blanks with values of (Delta) n up to 0.5, thicknesses and diameters up to 25 and 200 mm, respectively, have been produced by fusing together thin layers of glasses of progressively different indices of refraction. Smooth, step-free gradients are formed by controlled diffusion within and across the layers. Computer software has been developed to prescribe the gradient index profile and to control the diffusion process. Linear, quadratic, cubic, and a variety of other gradient index profiles can be produced by this method over a wide refractive index range. This paper discusses the diffusion software, process and metrology for a gradient blank currently in process to be used in a varifocal slide projector prototype.

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Xiaojie Xu, Max Andrew Wickson, Michael Savard, and Paul Sherman "Control of gradient index profile for gradient index glasses of macro size and large Δn for a varifocal slide projector lens", Proc. SPIE 2000, Current Developments in Optical Design and Optical Engineering III, (25 November 1993); https://doi.org/10.1117/12.163665

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