Figure 1 - uploaded by Fabio Di Teodoro
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(a) Scheme of a polarization-maintaining (PM) optical-fiberbased master oscillator/power amplifer (MOPA) architecture, featuring all-spliced-fiber frontend followed by a folded rod-type ytterbium-doped photonic crystal fiber (PCF) amplifier. (b) Pulse average power and energy of the MOPA output vs. diode power used for pumping the rod-type PCF final amplifier. Inset: near-field image of output beam at maximum power of 22W. (c) Temporal profile of emitted pulses. (d) Log-scale, peak-normalized optical spectrum of MOPA output at maximum power of 22W. Inset: 5GHz-resolution detail of pulse spectrum. : Frequency difference.
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