High efficiency second harmonic generation of nanojoule-level femtosecond pulses in the visible based on BiBO. (2019)

• Record Type: Journal Article
• Authors: Galletti, Mario; Pires, Hugo; Hariton, Victor; João, Celso Paiva; Künzel, Swen; Galimberti, Marco; Figueira, Gonçalo
• Is Part Of: High power laser science and engineering. Volume 7(2019)
• Publication Date: 2019
• Subjects: nonlinear process, -- second harmonic generation, -- pumping scheme, -- parametric amplification/oscillators, -- high power laser; High power lasers -- Periodicals; 621.366
• DOI: 10.1017/hpl.2018.72
• Languages: English
• ISSNs: 2095-4719

Abstract

Abstract : We demonstrate high efficiency second harmonic generation (SHG) of near infrared femtosecond pulses using a $\text{BiB}_{3}\text{O}_{6}$ crystal in a single-pass tight focusing geometry setup. A frequency doubling efficiency of $63\%$ is achieved, which is, to the best of our knowledge, the highest value ever reported in the femtosecond regime for such low energy (nJ-level) pumping pulses. Theoretical analyses of the pumping scheme focusing waist and the SHG efficiency are performed, by numerically solving the three wave mixing coupled equations in the plane-wave scenario and by running simulations with a commercial full 3D code. Simulations show a good agreement with the experimental data regarding both the efficiency and the pulse spectral profile. The simulated SHG pulse temporal profile presents the characteristic features of the group velocity mismatch broadening in a 'thick' crystal.