Tunable, pulsed multiline intracavity optical parametric oscillator using two-dimensional MgO: Periodically poled lithium niobate-aperiodically poled lithium niobate

We report a tunable, pulsed multiline intracavity optical parametric oscillator (IOPO) realized in an Nd:YVO₄ laser using a two-dimensionally domain engineered MgO:LiNbO₃ as simultaneously an electro-optic Bragg Q switch and a multichannel optical parametric downconverter. The MgO:LiNbO₃ was periodically and aperiodically poled along the crystallographic y and x axes, respectively, to simultaneously satisfy the phase-matching conditions required by the two quasi-phase-matching devices. When Q switched by 1 kHz, 300 V pulses, three signal lines at 1518, 1526, and 1534nmwere simultaneously generated, each with a peak power of ∼1 kWfrom the IOPO at 8.3Wdiode power at 50C. Spectral tuning of the three-line IOPO with temperature was demonstrated.