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.