Development of visible nano second pulse laser in a Pr-doped double-clad structured waterproof fluoride glass fiber using semiconductor saturable absorber mirror

We demonstrated a visible laser oscillation in a Pr-doped double-clad structured waterproof fluoro-aluminate glass fiber (Pr:DC-WPFGF). The maximum output power and the slope efficiency were measured to be 251.7 mW at 639 nm and 43.4%, respectively. And visible nano second pulse fiber laser at 639 nm was successfully demonstrated in the Pr:DC-WPFGF by a GaN laser diode excitation with a semiconductor saturable absorber mirror (SESAM). The visible Q-switched fiber laser output power of 0.85 mW was obtained at 292 mW of excitation power with the threshold power of 217 mW. The pulse duration and repetition rate were measured to be 360 ns and 205 kHz, respectively. The pulse energy and the pulse peak power were calculated to be 3.22 nJ and 8.94 mW, respectively. The peak wavelength and a full width at half-maximum were also measured to be 638.7 nm and 0.42 nm, respectively.We demonstrated a visible laser oscillation in a Pr-doped double-clad structured waterproof fluoro-aluminate glass fiber (Pr:DC-WPFGF). The maximum output power and the slope efficiency were measured to be 251.7 mW at 639 nm and 43.4%, respectively. And visible nano second pulse fiber laser at 639 nm was successfully demonstrated in the Pr:DC-WPFGF by a GaN laser diode excitation with a semiconductor saturable absorber mirror (SESAM). The visible Q-switched fiber laser output power of 0.85 mW was obtained at 292 mW of excitation power with the threshold power of 217 mW. The pulse duration and repetition rate were measured to be 360 ns and 205 kHz, respectively. The pulse energy and the pulse peak power were calculated to be 3.22 nJ and 8.94 mW, respectively. The peak wavelength and a full width at half-maximum were also measured to be 638.7 nm and 0.42 nm, respectively.