Dual-wavelength twin-pulse laser with tunable intensity and delay at 912 nm & 1064 nm under intracavity gain-switched pumping

Abstract

We report a dual-wavelength twin-pulse laser with tunable intensity and delay at 912 nm & 1064 nm with compactly combined Nd:GdVO₄ and Nd:YVO₄ crystals under intracavity gain-switched pumping. According to reports, this system was the first to eliminate gain competition between 912 nm & 1064 nm dual-wavelength twin-pulse laser. It also enabled intensity and delay control between the dual-wavelength twin-pulse by changing the absorbed pump power. The experimental findings revealed that the dual-wavelength twin-pulse laser attained the threshold of the absorbed pump power at 14.22 W. Further increasing the absorbed pump power, the intensity of the dual-wavelength twin-pulse increased, and the delay decreased accordingly. As a result, dual-wavelength twin-pulse with an intensity ratio of 0.89 to 1.37 and a delay of 21 ns to 7 ns were obtained. Under the maximum absorbed pump power of 16.77 W, the dual-wavelength twin-pulse laser achieved an average output power of 510 mW, with 215 mW for the 912 nm laser and 295 mW for the 1064 nm laser. The overall slope efficiency was 16.7 %. The maximum repetition rate was 30.07 kHz, the pulse width at 912 nm was 48.59 ns, and the pulse width at 1064 nm was 37.98 ns.