MgO:PPLN/Fe:ZnSe hybrid tunable burst-mode MOPA laser system

A tunable middle infrared (mid-IR) burst-mode master oscillator power amplifier (MOPA) laser system was reported in this paper. The master oscillator was a tunable burst-mode MgO-doped periodically poled lithium niobate (MgO:PPLN) optical parametric oscillator (OPO), whose pulse width was about 17 ns and the wavelength could be tuned continuously in the range of 3.76-4.05 µm. With a burst repetition rate of 10 Hz, a burst duration of 250 µs, and a single pulse repetition of 300 kHz, laser burst with the energy of 322.5 µJ, 298.2 µJ, and 280.4 µJ was obtained at wavelengths of 3.76 µm, 3.92 µm, and 4.05 µm, respectively. With a Fe:ZnSe amplifier cooled by the liquid nitrogen, the corresponding burst energy was amplified to 1.32 mJ, 1.79 mJ, and 1.96 mJ, respectively.