Abstract
In the last decade, high energy and high peak power pulsed fibre lasers have found numerous applications in different industrial and scientific fields. They are commonly based on a master oscillator power amplifier (MOPA) architecture, that features a high power fibre amplifier stage based on a rare earth (RE) doped silica glass fibre. However, heavy doping of silica fibres is limited by clustering, therefore the fibres length has to be increased to several meters for efficient amplification. The consequence is an unwanted growth of nonlinearities along with fibre length, that impairs considerably the temporal pulse properties of the amplifier and prevents to achieve high peak power [1].
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