Fig. 1. Photo and schematics of the prepared WTe2-particle-attached side-polished fiber.

Fig. 2. Measurements of (a) the scanning-electron-microscope (SEM) image and (b) the Raman spectra of the WTe2 particles on the top of the sticky surface of a small segment of Scotch tape.

Fig. 3. Measurements of (a) the EDS spectrum of the WTe2 particles and (b) the nonlinear transmission curve of the WTe2-particle-attached side-polished fiber.

Fig. 4. Experimental configuration of the proposed Q-switched YDF laser.

Fig. 5. (a) Measured optical spectrum of the output pulses at a pump power of ∼180  mW. (b) Measured oscilloscope traces of the output pulses for various pump powers.

Fig. 6. (a) Measured repetition rates and temporal widths of the Q-switched pulses as a function of the pump power. (b) Measured pulse energies and average powers as a function of the pump power.