Specialty Optical Fibers Handbook

acrylate coating on this fiber exhibits absorption especially in the 8- to 10-mm

region. The core/clad TeX fiber shows some strong extrinsic absorption bands.

From Fig. 13.6, there is strong absorption due to OH



(3 mm), Se-H (4.6 mm),

and H

2

O (6.3 mm). The data also show that the loss at 10.6 mm is rather large,

but it is significantly better at 9.3 mm where a CO

2

laser can operate. Using a

9.3 mmCO

2

laser, they were able to transmit 2.6 W of laser power through a

600-mm diameter, 1-m long fiber.

13.3 CRYSTALLINE FIBERS

Crystalline IR fibers are an attractive alternative to glass IR fibers because

most nonoxide crystalline materials can transmit longer ...