Method of shaping polycrystalline diamond

Details Method of shaping polycrystalline diamond Method of shaping polycrystalline diamond

1995-01-04

1996-03-19

Fiorilla, Christopher A.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Nonresinous material only

264293, B29D 1100

Patent

active

055001572

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., by laser ablation and/or polishing, are contemplated.

REFERENCES:
patent: 4339304 (1982-07-01), Grigoriev et al.
patent: 4737248 (1988-04-01), Nakamura et al.
patent: 5035771 (1991-07-01), Borse
Jin et al., App Phys Lett vol. 60(16), Apr. 20, 1992 p. 1948.
"Massive thinning of diamond films by a diffusion process", by S. Jin et al., Applied Physics Letters, vol. 60(16), Apr. 20, 1992, p. 1948.
"Polishing of CVD diamond by diffusional reaction with manganese powder", by S. Jin et al., Diamond and Related Materials, vol. 1, (1992), pp. 949-953.

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