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. 2018 Nov 28;7:94. doi: 10.1038/s41377-018-0099-5

Fig. 2. Output characteristics of the few-cycle thulium-doped fiber laser for intrapulse difference frequency generation (IPDFG).

Fig. 2

a Measured (red) and simulated (black) intensity autocorrelation of the nonlinear compressed pulses. The inset shows the numerically retrieved intensity envelope of the pulse with a peak power of 0.9 GW. b Measured spectrum (red) and simulated (black) spectrum of the nonlinearly compressed pulses emitted by the Tm:FCPA-seeded antiresonant hollow core fiber at 1.25 MHz repetition rate