Second harmonic generation due to the excitation of oppositely propagating surface polaritons on a quartz surface
Alieva E. V. , Zhizhin G. N. , Sychugov V. A. , Yakovlev V. A. , Van der Meer A. F. G. , Van der Wiel M. J.
The generation of the second harmonic (SHG) ~5μχη in a direction perpendicular to the surface of the sample is observed as a result of the excitation of oppositely propagating surface polaritons on quartz with a diffraction grating (18.2 μπι) by —10 μπι infrared radiation. The SHG is maximum in the region of the 10-cm"1 gap, produced by the diffraction grating, on the dispersion curve for quartz surface polaritons.