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Alessandro Farsi edited section_Four_wave_mixing_Bragg__.tex
almost 8 years ago
Commit id: b59ee85b713e09e475ade2dd5fd216ef0fd13392
deletions | additions
diff --git a/section_Four_wave_mixing_Bragg__.tex b/section_Four_wave_mixing_Bragg__.tex
index 84984f9..c4b2c35 100644
--- a/section_Four_wave_mixing_Bragg__.tex
+++ b/section_Four_wave_mixing_Bragg__.tex
...
The phasematching now reads $$ \kappa = ... $$
and simplifies to
$$
\label{eq:ph} \kappa = \beta^{(3)}/6 \left[ 3 \delta\omega \epsilon (\epsilon-2\Delta\Omega) \right ]+ ..
$$
...
In the approximation $\Delta\Omega \gg \Delta\omega \gg \epsilon$ we obtain a simpler expression for the process momentum conservation
$$ \kappa(\epsilon) * L = $$
in which we can identify the process acceptance-bandwidth $\delta\omega_{bs}$, and the frequency separation from symmetric point $\delta\epsilon = \frac{\beta^{(4)}}{3 \beta^{(3)}} \Delta\Omega^2$ due to higher-order dispersion \cite{Provo_2010}.
One prominent feature of FWM-BS, already noticed in [Inoue94,Marhic96] is highlighted by equation
(2), \ref{eq:ph}, that is translation for any given pair of signal and idler frequency can be exacly phasematched by choosing the appropriate pumps: this gives the flexibility of tuning the parameters of the interaction without the modifing the dispersion of the nonlinear medium.