Claims
- 1. A zinc sulfide article having at least one dimension in excess of ten inches and free of stress birefringence values exceeding 40 nm/cm.
- 2. The zinc sulfide article of claim 1, further characterized by being free of inclusions greater than 0.1 mm in diameter.
- 3. The zinc sulfide article of claim 1, further characterized by 450 nm wavelength transmission values in the range of 56 to 60%.
- 4. The zinc sulfide article of claim 1, further characterized by 550 nm wavelength transmission values in the range of 62 to 65%.
- 5. The zinc sulfide article of claim 1, further characterized by having forward scatter values of 3.5 to 6.0 cm−1 when measured with a He—Ne laser.
- 6. The zinc sulfide article of claim 1, having a thickness of at least ¼ inch.
- 7. The zinc sulfide article of claim 1 having at least one dimension in excess of 15 inches.
- 8. A zinc sulfide article according to claim 1 which is free of stress birefringence values in excess of 20 nm/cm.
Parent Case Info
This application is a divisional of copending application application Ser. No. 09/287,893 filed on Apr., 7, 1999 now U.S. Pat. No. 6,221,482.
US Referenced Citations (7)
Non-Patent Literature Citations (1)
Entry |
U.S. patent application Ser. No. 09/018,969, filed Feb. 5, 1998 by Goela, Jitendra et al. |