1：Experimental Design and Method Selection:

The experiment utilized a tunable mode-locked ytterbium-doped fiber laser setup incorporating a single-walled carbon nanotubes saturable absorber and a reflective grating for wavelength tuning.

2：Sample Selection and Data Sources:

SWCNTs were grown using the electric arc discharge technique and prepared into films for use as SAs.

3：List of Experimental Equipment and Materials:

The setup included a wavelength division multiplexer, ytterbium-doped fiber, collimators, a half-wave plate, a polarization-independent isolator, a reflective grating, an output coupler, a polarization controller, and a laser diode.

4：Experimental Procedures and Operational Workflow:

The laser was pumped by a laser diode, and mode-locking was achieved by adjusting the pump power and polarization controller settings. The reflective grating was rotated to tune the output wavelength.

5：Data Analysis Methods:

Output spectra were measured using an optical spectral analyzer, pulse duration with an intensity autocorrelator, and pulse trains with a digital storage oscilloscope.