Electro-optic Q-switched dual-wavelength coaxial alternating output laser at 1064 and 1319 nm

•Voltage-increased and voltage-decreased EO Q-switched technologies are applied in combination.•The coaxial alternating 1064 and 1319 nm pulses was obtained.•It provides an effective way to obtain high repetition rate laser.•It breaks through the limitation between single pulse energy and output power of traditional laser. In this study, by combining the voltage-increased and voltage-decreased electro-optic (EO) Q-switched technologies, a dual-wavelength coaxial alternating output solid-state laser operating at 1064 and 1319 nm is demonstrated. Two wavelengths are generated from different gain medias, and combined together with a shared EO Q-switcher which is accomplished by using a double-crystal RbTiOPO4 (RTP). The coaxial alternating 1064 nm and 1319 nm Q-switch pulses with 200 μs delay are obtained. This produces a maximum output energy of 38.96 mJ with a pulse width of 15.7 ns for the 1319 nm component, and a maximum output energy of 38.73 mJ with a pulse width of 14.7 ns for the 1064 nm component at a pulse repetition frequency (PRF) of 10 Hz when the pumping current are 90 A and 70 A, respectively.