WEB EXCLUSIVE A new cyclic olefin polymer (COP) from Zeon Chemicals L.P., Louisville, Ky., offers high light transmission and a stable refractive index after prolonged heat exposure to blue lasers in Blu-ray pickup lenses and prisms.

WEB EXCLUSIVE A new cyclic olefin polymer (COP) from Zeon Chemicals L.P., Louisville, Ky., offers high light transmission and a stable refractive index after prolonged heat exposure to blue lasers in Blu-ray pickup lenses and prisms. Blue lasers generate wavelengths of about 400 nm and have a tendency to degrade plastics after long-term exposure at temperatures up to 80 C, according to the company. Zeonex 340R retains 92% light transmission after 1700 hr of irradiation (85 C, 400 mW/cm2). Competitive cyclic olefins showed a light transmission loss of 7% to 8% under the same conditions. The material is said to have a stable Abbe number from 10 C to 60 C. Similarly, the refractive index is stable over that temperature range and at wavelengths from 40 to 700 nm. (502) 775-2000 * www.zeonchemicals.com

Zeon Chemicals Incorporated
4111 Bells Lane Louisville, KY 40211
Phone (502) 775-2000 Fax (502) 775-2055