2025/04/09 by M. Inman, Inman, Michel, Zhaohui Ma +5
Physics and Astronomy · #Advanced Fiber Laser Technologies #Photorefractive and Nonlinear Optics #Mechanical and Optical Resonators
paper · pdf · doi:10.48550/arxiv.2504.07009
Lithium niobate nano photonics provides highly efficient nonlinear optics processes covering a broad spectrum from ultraviolet to mid-infrared, yet studies thus far have concentrated in the near-infrared regime. Here we demonstrate light generation in the Ultraviolet-A band in a periodic poled waveguide via second harmonic generation. The internal efficiency reaches 1797 % W-1/cm-2, marking a 9.1-times improvement over the state of art, thanks to better mode overlap and poling. Our technique can find applications in atomic clocks, frequency comb generation, sensing, and visible entanglement generation.