Second to fifth harmonic generation in individual β-barium borate

We have studied the nonlinear optical properties of single beta-barium borate nanocrystals, with potential applications as probes in nonlinear sensing and imaging schemes. Our work demonstrates their ability to generate second, third, fourth, and fifth harmonics. The particles' polarization response is studied and compared with simulations based on the bulk nonlinear tensors, with good agreement. Furthermore, the nonlinear susceptibilities of different orders are estimated. (C) 2022 Optica Publishing Group

Automated summary

We have investigated the nonlinear optical properties of single beta-barium borate nanocrystals and demonstrated their ability to generate multiple harmonics. The particles' polarization response was compared with simulations based on bulk nonlinear tensors, showing good agreement. The nonlinear susceptibilities of different orders were also estimated.