Abstract
The problem of delivering a multimode pump to a single mode core is considered. Original designs of double-clad fiber amplifiers are analyzed. A slab pump geometry of a fiber amplifier is suggested. The partially coherent pump should be coupled to the narrow slab which supports propagation of the pump and absorbs highest modes of the core, then the core itself has no need to be single-mode. The slab plays the role of cladding in conventional double-clad fibers. Such a cladding has no need to surround the core and its refractive index can be higher than that of the core. Then the highest modes of the slab are absorbed at very beginning of the amplifier. This allows for tapering of the slab, providing almost constant pump power in the core. The end result is a the high efficiency of a compact device with scaling to high pump power. We provide the key design formulas for such a device.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 111-119 |
| Number of pages | 9 |
| Journal | Proceedings of SPIE - The International Society for Optical Engineering |
| Volume | 4993 |
| DOIs | |
| State | Published - 2003 |
| Event | High-Power Fiber and Semiconductor Lasers - San Jose, CA, United States Duration: Jan 27 2003 → Jan 27 2003 |
Keywords
- Amplifiers
- Doped fibers
- Double-clad fibers
- High power fiber lasers
- Slab waveguide
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering