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(a,b) Laser setups. Common to both: YDFA: Yb-doped fiber amplifier; SWNT: nanotube based saturable absorber; PC: polarization controller; OC: fused fiber output coupler; ISO: isolator. Setup (a) has also a dispersive fiber (DF). In setup (b), the DF is removed and a circular (C) and a chirped Bragg grating (CBG) are included.
Intensity autocorrelation (a) and spectrum (b) for the 10 m cavity.
Pulse shape (a), with fit (red dashes). Corresponding spectra (b) for the 1200 m cavity.
Pulse energy (a) and pulse duration (b) as a function of cavity length. Pulse duration measured using an autocorrelator (triangles) or a fast photodiode and sampling oscilloscope (circles).
RF spectrum (a) and pulse train (b) of the 1200 m laser.
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