Figure 1 | Scientific Reports

Figure 1

From: Direct compression of 170-fs 50-cycle pulses down to 1.5 cycles with 70% transmission

Figure 1

(a) Normalized autocorrelation traces of the input pump pulse (170 fs) and the compressed pulses after the 0.75-m-, 3-m-, and 6-m-long Ar-filled HCFs (FWHM: 14, 7, and 5.1 fs, respectively). The total GDDs required in each case are −467.2, −246.9, and −338.6 fs2 considering both chirped mirrors and the additional glass windows for fine-tuning. (inset) Pump pulse spectrum. (b) NIR-visible spectra for each of the three fiber lengths at optimum pressure conditions.

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