Low scatter, high quality water clear zinc sulfide

Details Low scatter, high quality water clear zinc sulfide Low scatter, high quality water clear zinc sulfide

1998-02-05

2000-07-04

King, Roy V

Coating processes

Coating by vapor, gas, or smoke

Mixture of vapors or gases utilized

42725531, 427166, C23C 1630

Patent

active

060835613

ABSTRACT:
An improved chemical vapor deposition (CVD) process which is capable of providing low-scatter water-clear zinc sulfide bulk material is described. The improved method also minimizes bowing, or induced curvature, in the product bulk material. The product zinc sulfide material can be processed into thicker windows and optical devices than was possible with the articles produced by the previous CVD process. The improved process provides for a controlled gradual initial ramping up of the deposition rate and a controlled initial ramping down of the substrate temperature.

REFERENCES:
patent: 4944900 (1990-07-01), Willingham et al.
patent: 4978577 (1990-12-01), Purohit et al.
patent: 5077092 (1991-12-01), Smith et al.
patent: 5686195 (1997-11-01), Taylor et al.

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