Raymond H Wolfe

US Patent:

55001572, Mar 19, 1996

Filed:

Jan 4, 1995

Appl. No.:

8/368581

Inventors:

John E. Graebner - New York NY
Sungho Jin - Millington NJ
Raymond Wolfe - New Providence NJ

Assignee:

AT&T Corp. - Murray Hill NJ

International Classification:

B29D 1100

US Classification:

264 121

Abstract:

A technique that involves selective removal of material from a surface of a polycrystalline diamond (polyD) film such that a non-planar surface results. Exemplarily the technique is used to form polyD optical elements, e. g. , convex or concave lenses, or Fresnel lenses, including arrays of such lenses. The technique involves maintaining on appropriately shaped hot template body in intimate contact with a polyD surface for a time (e. g. , in the range 1-1000 hours) sufficient to result in formation of the desired feature in the polyD surface. The template body involves a rare earth metal (La and Ce are preferred), Mn and/or Fe, and the temperature is below the melting temperature of the template body. Removal of "spent" template material by, e. g. , chemical etching and finishing of the polyD feature, e. g.