Specialty Optical Fibers Handbook

dictated primarily by the brightness of available pump diodes and the total

power being coupled. The geometry of the inner cladding is typically shaped to

prevent the propagation of skew rays that might otherwise pass down the fiber

length without traveling through and being absorbed by the doped core region.

22.3 LARGE-MODE-AREA YTTERBIUM- DOPED

FIBERS: THE POWER REVOLUTION

For certain applications, such as ranging and free-space communications,

operating in the ‘‘eye-safe’’ 1.5–2.0 mm range is preferred. Furthermore, there

are a number of sensing and medical applications that require other specific

wavelengths. For such applications, it becomes necessary ...