Counter-Propagating Beams Second Harmonic Generation

Counter-Propagating Beams Second Harmonic Generation 

Normandin etal. [181,183-186] proposed a new geometry for SHG generationin poled polymer waveguides using counter-propagating beams at fundamental frequency, as shown schematically in Fig. 46. Two beams with co frequency propagate in opposite direction, and in the area of their overlap 2co beam is emitted perpendicular to the thin him surface with intensity [181]  

Although the conversion efficiency is not very high the technique can be used for beam demultiplexing in the two-wave mixing conhguration. Due to the wave vector conservation requirement the direction of the sum frequency beam emission depends on the ratio of the incident beam frequencies. 

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Counter-Propagating Beams Second Harmonic Generation... 

Otomo, A., Mittler-Neher, S., Bosshard, S Stegeman, G. I., Horsthuis, W. H. G., and Mohlmann, G. R., Second harmonic generation by counter propagating beams in 4-dimethyl-4 -nitrostilbene side-chain polymer channel waveguides, Appl, Phys. Lett., 63, 3405-3407 (1993). 

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