Fig. 6: Optimum value of \({\tilde{F}}_{C}\) as a function of cavity length, for different momentum widths.

\({\tilde{F}}_{{C}_{{\rm{opt}}}}\) increases up to a maximum value and then decreases with increasing cavity length. The optimum cavity length which gives \({\tilde{F}}_{{C}_{{\rm{opt}}}}\) varies with the momentum width. Here, k0 = 2π/(780 nm).