Quantitative Measurements of Second-Order Nonlinear Susceptibility with Collinear Reflective Second Harmonic Generation

Polarization-dependent second harmonic generation is a widely utilized technique for characterizing symmetry. However, in collinear reflective geometry, the essential beam-splitting device significantly influences both the polarization state of the fundamental and harmonic beams, thereby affecting the accuracy of the obtained second-order nonlinear susceptibility. Here, we propose a data correction method to solve this problem to obtain accurate second-order nonlinear susceptibility. The feasibility and generality of the method are demonstrated through theoretical and experimental validation.