Fig. 1. (a) Photograph of green cavity-dumped Ho3+-doped fiber laser. (b) Schematic of green cavity-dumped Ho3+-doped fiber laser. (c) Optical transmission spectra of the visible-reflection mirror (M1) at 30° deflection, fiber pigtail mirror (M2), and visible-reflection mirrors (M3, M4), respectively.

Fig. 2. (a) Periodical electric signal. (b) Formation of cavity-dumped green laser pulses and diffraction efficiency measurement at 543 nm of visible wavelength spatial modulator. (c) Process of generating cavity-dumping pulses by controlling the duty cycle of trigger signals.

Fig. 3. Characteristics of the green cavity-dumped pulse operation at the millijoule energy level. (a) Single pulse. Inset: typical oscilloscope trace. (b) RF output spectra at 100 Hz. Inset: corresponding broadband RF output. (c) Output optical spectrum. Inset: close look at 543.02 nm. (d) Average output power as a function of the pump power envelope with gain fiber at different lengths. Inset: beam quality parameter and near-filed intensity distribution.

Fig. 4. (a) Output optical spectrum and (b) single pulse of the green cavity-dumped pulse under different pulsed energy.

Fig. 5. Pulse trains based on cavity-dumping technology at different repetition rates.

Fig. 6. Output characteristics of green cavity-dumped pulse at different repetition rate. (a) Corresponding average power and pulse energy at different repetition rates. (b) Corresponding pulse width and peak power at different repetition rates.

Table 1. Performance Comparison of Rare-Earth-Doped Pulsed Fiber Lasers at Green Wavelengths