Components for Fiber Lasers

Authored by: Liang Dong , Bryce Samson

Fiber Lasers

Print publication date:  September  2016
Online publication date:  September  2016

Print ISBN: 9781498725545
eBook ISBN: 9781315370521
Adobe ISBN:

10.1201/9781315370521-7

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Abstract

For the purposes of this chapter we will split fiber devices into two broad categories, CW and pulsed fiber lasers. The attraction of fiber laser devices is the monolithic nature of their architecture, using a series of spliced fiber components from the diode pump source through to the output of the laser. The lack of any glass/air surfaces along the chain of components eliminates any misalignment and contamination problems during the lifetime of the laser and increases efficiency due to the reduced losses at the interfaces. In the case of a CW fiber laser, a typical monolithic architecture is shown in Figure 6.1 [1], showing the key elements of an Yb-doped fiber laser operating around 1060 nm. These components include the fiber Bragg gratings (FBGs) forming the laser cavity, the tapered fused bundles (TFBs) for multiplexing many pump diodes, the pump laser diodes themselves along with components such as cladding light stripper and tap coupler. This entire chain of components is optimized for low splice loss between fibers, particularly at high powers where excess loss is not only costly but also leads to lower reliability. Currently, there are multiple commercial suppliers for all the key components for making these CW laser devices even at the kW power level, as we will discuss in later chapters.

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