Fig. 1. (Color online) Absorbance and PL curves of the green colloidal quantum dot (CQD) sample with an inset of the TEM image.

Fig. 2. (Color online) Open aperture Z-scan measurements of the saturable absorption property of the as-fabricated CQD, using a femtosecond laser source at 515 nm.

Fig. 3. Schematic of blue diode-pumped passively Q-switched Pr:YLF laser at 522 nm.

Fig. 4. (Color online) Green laser output power characteristics in continuous-wave and Q-switching regimes.

Fig. 5. Spectrum of the Q-switched Pr:YLF laser at 522 nm. Inset: photograph of the green laser beam spot.

Fig. 6. Pulse trains measured at average output powers of (a) 4.9 mW at the threshold with a repetition rate of 79.6 kHz and (b) 28.5 mW with a repetition rate of 168.9 kHz.

Fig. 7. Narrowest pulse with time duration of about 0.84 μs.

Fig. 8. (Color online) Variations of pulse widths and pulse repetition rates with the increase of absorbed pump powers for a 522 nm Q-switched Pr:YLF laser.

Fig. 9. (Color online) Corresponding dependence of pulse energy and pulse peak power on absorbed pump power.