Phys.org March 18, 2022
An international team of researchers (China, USA – Arizona State University) generated structured transverse mode locking (TML) beams and second harmonic generation (SHG) beams by a sandwich-like microchip laser cavity that was passively Q-switched. They observed many rare SHG far-field beam patterns and their experiments showed good agreement with the simulations. It showed that parametric variation for the TML modes greatly changes the far-field beam patterns of the SHG beam. Generated SHG beam patterns vary with the propagation, and then they remain stable into the far field. The SHG beam patterns were observed to have more obvious structural characteristics than those of the fundamental frequency beam. The work will help advance future applications of structured beams, particularly in optical 3D printing, optical trapping of particles, and free-space optical communication areas…read more. Open Access TECHNICAL ARTICLEÂ
Far-field SHG beam patterns of various TML beams marked on the Poincaré sphere… Credit: Advanced Photonics, 4(2), 026002 (2022).Â