1. Quasi-phase matched anti-Stokes stimulated Raman scattering; Saint-Petersburg, 6 – 9 June 2003 Makarov N.S., mak_nick@newmail.ruBespalov V.G., bespalov@admiral.ru Raman active medium H2H2 H2H2 H2H2 H2H2  (3)  0  (3) =0 Method principle System of forward and backward multiwawe SRS equations  j i – wave mismatching, g j ± – steady-state Raman gain coefficient,  j – frequencies of interacting waves, E j ± – complex wave amplitudes L a (opt) L p (opt) Zoom Layer lengths selection In simulations we used various Raman-active media, like hydrogen, barium nitrate, silica fiber, photonic crystals. The efficiency of anti-Stokes generation reached about 30% and practically compared to Stokes generation efficiency. The efficiency of high- order components was negligible.

2. Principle of quasi-phase matching at SRS Generalized phase on active layers input do not practically change, that in a final result provides a realization of quasi- phase matching conditions , rad  (3)  0  (3) =0 Quasi-phase matched anti-Stokes stimulated Raman scattering; Saint-Petersburg, 6 – 9 June 2003 Makarov N.S., mak_nick@newmail.ruBespalov V.G., bespalov@admiral.ru

3. Barium nitrate Hydrogen Raman gain dispersion Quasi-phase matched anti-Stokes stimulated Raman scattering; Saint-Petersburg, 6 – 9 June 2003 Makarov N.S., mak_nick@newmail.ruBespalov V.G., bespalov@admiral.ru

4. Quasi-phase matched anti-Stokes stimulated Raman scattering; Saint-Petersburg, 6 – 9 June 2003 Makarov N.S., mak_nick@newmail.ruBespalov V.G., bespalov@admiral.ru Backward SRS vs. QPM realization High SRS components vs. calc. precision

5. Quasi-phase matched anti-Stokes stimulated Raman scattering; Saint-Petersburg, 6 – 9 June 2003 Makarov N.S., mak_nick@newmail.ruBespalov V.G., bespalov@admiral.ru Influence of input waves parameters on anti- Stokes generation efficiency

6. Quasi-phase matched anti-Stokes stimulated Raman scattering; Saint-Petersburg, 6 – 9 June 2003 Makarov N.S., mak_nick@newmail.ruBespalov V.G., bespalov@admiral.ru The influence of pump wavelength on anti- Stokes generation efficiency

7. Quasi-phase matched anti-Stokes stimulated Raman scattering; Saint-Petersburg, 6 – 9 June 2003 Makarov N.S., mak_nick@newmail.ruBespalov V.G., bespalov@admiral.ru Effective wave vector in one-dimension photonic crystal The effective generation of anti- stokes radiation in one dimensional photonic crystals  1 =1,  2 =13, l 1 =175.0000 nm, l 2 =287.8774 nm   =0.263 rad/cm; eff_a=30.1%  1 =1,  2 =13, l 1 =175.037 nm, l 2 =287.870 nm   =0.004 rad/cm; eff_a=29.8%

8. Conclusions Our model of forward and backward multiwave SRS is the extension of multiwave SRS model and it may be reduced to well-known systems of forward multiwave SRS and backward SRS For best accuracy of QPM SRS simulations it is necessary to take into account the dispersion of Raman gain coefficient The influence of backward SRS on QPM structure realization results in the small difference between layers length of optimal QPM structure and small decreasing of resulting anti-Stokes conversion efficiency (~25% at backward and forward SRS, ~30% at forward SRS), however it is still high enough For studying of multiwave SRS influence on QPM structure realization it is necessary to take into account the generation at least of 3 Stokes and 3 anti- Stokes SRS components The effective anti-Stokes SRS generation occurs in a wide range of input radiation parameters It is possible to use one-dimension photonic crystals for high effective (up to 30%) anti-Stokes SRS generation Quasi-phase matched anti-Stokes stimulated Raman scattering; Saint-Petersburg, 6 – 9 June 2003 Makarov N.S., mak_nick@newmail.ruBespalov V.G., bespalov@admiral.ru

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