Analysis and optimization of Cherenkov second harmonic generation from a channel waveguide

Based on the coupled-mode theory, Cherenkov second harmonic generation (CSH G) from a channel waveguide has been analyzed and optimized comprehensively and systematically, taking the propagation loss, the conversion depletion and the birefringence into account. The results show that the propagation l oss, the conversion depletion and the birefringence have an important influ ence on CSHG. Furthermore, quasi-phase-matched CSHG has been investigated a nd optimized, the numerical calculations demonstrate that a high conversion efficiency (more than 30%) with a relatively wide fabricating tolerance ca n be realized by tuning the fundamental wavelength under the relatively ver y low input fundamental power (10 mW), and the optimum parameters including the waveguide thickness, the reversal period, the fundamental wavelength a nd the fabricating tolerance have been obtained. (C) 2001 Published by Else vier Science B.V.