High repetition rates optically active langasite electro-optically Q-switched laser at 1.34 μm

An electro-optically Q-switched pulsed laser at 1.34 μm with a repetition rate of 100 kHz applying optically active langasite (La₃Ga₅SiO₁₄) crystal has been reported. With Nd:YVO₄ as laser crystal, the electro-optically Q-switched pulsed lasers were obtained with the maximum repetition rate of 100 kHz, maximum average output power of 2.42 W, and a minimum pulse width of 2.4 ns. Based on the theory of rate equations, the optimal pulse energy of the electro-optical Q-switching could be calculated. The experimental results have been found to be matched well with the theoretical calculations. To the best of our knowledge, this work presents the highest repetition rate and shortest pulse width which are achieved by an electric-optic LGS Q-switching at the wavelength of 1.34 μm, and it enriches the material categories for generating the high repetition rate pulsed laser.