A model is presented that includes broadband, off-axis light generation for parametric downconversion processes. We apply this to parametric generation with material parameters adapted for periodically poled lithium niobate; our simulations are compared with experimental results. Our simulations explore the competition between on-axis and off-axis signal generation. With a broad-area pump, we find that a shorter crystal is more effective at suppressing off-axis signal generation.
© 2004 Optical Society of America
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
(190.4420) Nonlinear optics : Nonlinear optics, transverse effects in
Yiyi Guan, Joseph W. Haus, and Peter Powers, "Broadband and off-axis optical parametric generation in periodically poled LiNbO3," J. Opt. Soc. Am. B 21, 1225-1233 (2004)