Two-dimensional aperiodic nonlinear photonic crystal in a dual-wavelength Nd:YVO₄ laser for pulsed orange generation

We report the design and construction of a highly integrated twodimensional (2D) aperiodic nonlinear photonic crystal (NPC) for working in a diode-pumped, dual-wavelength (1064 and 1342 nm) Nd:YVO₄ laser to demonstrate a compact, high-peak-power intracavity sum-frequency generator (ISFG) radiating at orange 593.5 nm. The 2D aperiodic NPC was built in quasi-phase-matched LiNbO₃ whose crystal domain was structured based on the aperiodic optical superlattice technique to best achieve its simultaneous performance of a dual-wavelength electro-optic Bragg Q-switch and a SFG in the Nd:YVO₄ laser. When the NPC device was driven with a 350-V Q-switching voltage and a 1-kHz switching rate, we measured pulse energy of ∼4.3 μJ (or peak power of ∼531 W) at orange 593.5 nm from the constructed ISFG with 5.28-W diode power.