Featuring CW lasers in the kilowatt class, pulsed lasers from nanoseconds to ultrafast, and wavelengths ranging from 1 to 2 m, fibre lasers are undoubtedly the most revolutionary laser technology to appear in the past ten years. The fundamental laser physics of these systems, waveguide designs to enhance device performance, fibre spectroscopy, and nonlinear fibre constraints are all covered in this chapter. All of the major fibre laser operating regimes, as well as the most recent cutting-edge research employing innovative fibre designs, are covered in depth, as are several important experimental findings from the previous ten years.
For instance, fibre laser technology was created for the first time in the 1960s. This technology was still in its infancy at the time. It didn't become suitable for commercial usage until the 1990s. Since then, the technology has advanced significantly in terms of its uses and effectiveness. In the 1960s, it was only feasible to produce a few tens of milliwatts; now, fibre lasers are capable of producing over 1000 watts with consistent final qualities.
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