Dual-wavelength twin-pulse laser at 912 and 1064  nm without gain competition

We employed a high-repetition-rate quasi-three-level 912 nm pulsed laser as the gain-switched pump source, generated by an <i>N</i><i>d</i>:<i>G</i><i>d</i><i>V</i><i>O</i>₄ laser gain medium and a <i>C</i><i>r</i>⁴⁺:<i>Y</i><i>A</i><i>G</i> saturable absorber. The 912 nm laser directly pumps the <i>N</i><i>d</i>:<i>Y</i><i>V</i><i>O</i>₄ crystal within the resonator. For the first time, to our knowledge, we achieved a high-repetition-rate dual-wavelength twin-pulse laser output at 912 and 1064 nm without gain competition. With an incident pump power of 36.8 W and a laser gain medium separation distance of <i>D</i>=10<i>m</i><i>m</i>, the twin-pulse laser exhibited a repetition rate of 30.5 kHz and a time interval of 7 ns between the twin pulses. Under these conditions, the average output powers of the 912 and 1064 nm lasers were 200 and 280 mW, respectively. Furthermore, by adjusting the separation distance D, we demonstrated the tunability of the time interval between the twin pulses within the range of 7-17 ns.