We present a fast and accurate method to calculate the vector-field distribution of a focused Gaussian beam. This method is applied to calculate the second harmonic that is generated by such a beam from a sample in the undepleted pump approximation. These calculations can be used to model second-harmonic imaging in an optical microscope with a wide aperture.
© 2004 Optical Society of America
Ara A. Asatryan, Colin J. R. Sheppard, and C. Martijn de Sterke, "Vector treatment of second-harmonic generation produced by tightly focused vignetted Gaussian beams," J. Opt. Soc. Am. B 21, 2206-2212 (2004)