Linear compression of chirped pulses in optical fibre with large step-index mode area

Abstract

The possibilities and limitations of linear compression of positively chirped pulses in the negative-dispersion region of a step-index large mode-area single-mode optical fibre are investigated for the first time. Analytical formulae for critical values of radiation power are found, below which pedestal-free pulse compression is possible down to the Fourier limit. It is demonstrated that at radiation powers exceeding these critical values, there exists an optimal compressing fibre length, over which laser pulses reach the minimum of the time-bandwidth product, and beyond which irreversible pulse deformation occurs. The modelling results agree well with the experimental data.

Double-scale Pulses Generated by Mode-locked Fibre Lasers and Their Applications

“…Conversely, double-scale pulses present very limited possibilities of compression [24]. It has to be stressed that these limitations arise from the structure of the pulses themselves rather than from non-linear effects in fibre-optical compressors, which may also constrain compression coefficient of 'regular' laser pulses at sufficiently high-peak-power values [28].…”

Ytterbium-doped fibers for high-power fiber lasers

“…LMA fibers can also be utilized in the latter part i.e. as a pulse compressor in an all-fiber CPA system since the chirped pulse propagation in an optical fiber engenders decrement in the temporal width of the pulse in the negative dispersion (anomalous) regime [5].…”

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